Association between eating habits, body mass index, cardiorespiratory fitness, and cardiometabolic risk factors in children

Associação entre os hábitos alimentares, índice de massa corporal, aptidão cardiorrespiratória e fatores de risco cardiometabólico em crianças

ABSTRACT

Objective

To verify the multivariate relationships between eating habits, cardiorespiratory fitness, body mass index, and cardiometabolic risk factors in children.

Methods

This is a cross-sectional study developed in a public elementary school with 60 first- to sixth-graders. Their eating habits were assessed using the Food Frequency Survey, weight, height, and cardiorespiratory fitness, assessed according to the Projeto Esporte Brasil protocol. Moreover, the variables, high-density lipoprotein, low-density lipoprotein, glucose, insulin, C-reactive protein, adiponectin, leptin, diastolic and systolic blood pressure were evaluated. Descriptive statistics were used for data analysis and generalized estimation equations were used for the analysis of direct and indirect relations, in a multivariate analysis model with several simultaneous outcomes.

Results

It appears that the eating habits and cardiorespiratory fitness explain 20% of the body mass index. Cardiometabolic risk factors are explained by the relationship between eating habits, cardiorespiratory fitness, and body mass index, according to the following percentages: 29% (systolic blood pressure), 18% (diastolic blood pressure), 63% (leptin), 4% (adiponectin), 14% (C-reactive protein), 17% (insulin), 10% (high-density lipoprotein), 1% (low-density lipoprotein), 4% (glucose). It is also observed that the effects of the eating habits on cardiometabolic risk factors are indirect, that is, they are dependent on changes in the body mass index and cardiorespiratory fitness levels.

Conclusions

The relationship between eating habits and cardiometabolic risk factors in children is dependent on cardiorespiratory fitness and body mass index. Thus, our findings suggest a multivariate relationship between these factors.

Keywords
Cardiovascular diseases; Cardiorespiratory fitness; Children; Feeding behavior

RESUMO

Objetivo

Verificar as relações multivariadas entre hábitos alimentares, aptidão cardiorrespiratória, índice de massa corporal e fatores de risco cardiometabólico em crianças.

Métodos

Trata-se de um estudo de corte transversal, desenvolvido com 60 crianças em uma escola pública, de ensino fundamental. Os hábitos alimentares foram avaliados por meio do Inquérito de Frequência Alimentar, peso, estatura e aptidão cardiorrespiratória, avaliados de acordo com o protocolo do Projeto Esporte Brasil. Ainda, foram avaliadas as variáveis lipoproteína de alta densidade, lipoproteína de baixa densidade, glicose, insulina, proteína C-reativa, adiponectina, leptina, pressão arterial diastólica e sistólica. Para a análise de dados, utilizou-se estatística descritiva e, para a análise das relações diretas e indiretas, equações de estimativa generalizadas, em uma modelagem de análise multivariada com diversos desfechos simultâneos.

Resultados

Verifica-se que os hábitos alimentares e a aptidão cardiorrespiratória explicam o índice de massa corporal em 20%. Os fatores de risco cardiometabólico são explicados pelas relações entre hábitos alimentares, aptidão cardiorrespiratória e índice de massa corporal, de acordo com os seguintes percentuais: 29% (pressão arterial sistólica), 18% (pressão arterial diastólica), 63% (leptina), 4% (adiponectina), 14% (proteína C-reativa), 17% (insulina), 10% (lipoproteína de alta densidade), 1% (lipoproteína de baixa densidade), 4% (glicose). Ainda, observa-se que os efeitos dos hábitos alimentares nos fatores de risco cardiometabólico são indiretos, isso é, são dependentes das alterações no índice de massa corporal e nos níveis aptidão cardiorrespiratória.

Conclusão

A relação entre os hábitos alimentares e os fatores de risco cardiometabólico em crianças é dependente da aptidão cardiorrespiratória e do índice de massa corporal, de forma que os achados deste estudo sugerem uma relação multivariada entre esses fatores.

Palavras-chave
Doenças cardiovasculares; Aptidão cardiorrespiratória; Crianças; Comportamento alimentar

INTRODUCTION

Obesity is a chronic disease with a multifactorial clinical condition – heredity, inadequate diets, and low levels of physical activity are all risk factors for it [¹]. Additionally, it is the main cause of childhood and teenage non-transmissible chronic diseases, such as diabetes, hypertension, and dyslipidemias [²-⁵].

The relationship between nutritional states and metabolic risks in children and teenagers is well established in the literature. Several studies associate higher values of the Body Mass Index (BMI) with increased levels of triglycerides and fasting glycaemia, as well as with the reduction of High-Density Lipoprotein Cholesterol (HDL-C) [⁶-⁸]. Thus, evaluating the BMI allows monitoring the nutritional state in a simple and operational way, also granting important information for health assessments in the school.

In this context, the nutritional state is directly influenced by dietary habits [⁹]. For instance, obese kids usually have characteristic diets, with great intakes of sodium, fat, and sugar, but poor in fruits, vegetables, and fibers [⁹,¹⁰]. However, the relation between eating habits and chronic diseases is still uncertain, especially for children and teenagers. The ways in which unhealthy diets influence children’s biochemical parameters like inflammatory cytokines, C-Reactive Protein (CRP), adiponectin, triglycerides, total cholesterol, glucose, and insulin, remain unclear [¹¹,¹²].

Monitoring eating habits and evaluating the BMI are not only important for diagnosing obesity and overweight. Cardiorespiratory Fitness (CRF) is one of the most important health predictors in children and teenagers [¹³,¹⁴]. Studies show that lower CRF levels are linked with cardiovascular risk and metabolic syndrome [⁹,¹⁵,¹⁶]. Some authors suggest that CRF is connected with the nutritional state in children of school age, meaning that good CRF levels are associated with adequate BMI values [¹⁷-¹⁹]. Also, the literature has shown that CRF might influence the relation between obesity and cardiovascular risk [²⁰-²²].

Thus, research has been concerned with the proper ways of interpreting the relationship between obesogenic behaviors, no longer in an individual fashion, but centering the effects of their interactions in kids’ cardiometabolic risk factors [²²]. The authors suggest that the eating habits, the CRF levels, and the nutritional state are related in an unclear way and that the conjunction of these behaviors might support a connection between eating habits, obesity and overweight, and the early risk of developing several cardiometabolic factors [²³,²⁴].

The literature has presented associations between eating habits and inflammatory states in children and teenagers [¹,¹²,²⁰]. Improved CRF and physical and muscular fitness, opposingly, result in better levels of inflammatory markers [⁶,¹²,¹⁴]. It should be noted that the adipose tissue is no longer seen as solely energy storage and is now considered an endocrine organ which expels different metabolites with different functions. Therefore, different dietary patterns, nutritional states, and CRF seem to influence the inflammatory states of children and teenagers [¹²].

Consistent evidence of the relations between eating habits, BMI, CRF, and the cardiovascular and cardiometabolic risk factors during childhood is definitely lacking. This gap in the literature is the main justification for the present study. Our working hypothesis is that the BMI and the cardiometabolic risk factors are directly related, and that the eating habits, CRF, BMI, and cardiometabolic risks are indirectly related. The goal of this study, then, is to verify the multivariate relations between eating habits, CRF, BMI, and cardiometabolic risk factors in children.

METHODS

The cross-sectional quantitative study was carried out in a public school in Porto Alegre, Brazil. The population included all first- to fifth-graders in the school (n=480). All the students that completed the assessments (anthropometric, eating habits, blood, blood pressure, and CRF) were included. The convenience sample was composed of 60 students (27 boys and 33 girls) with ages between six and eleven. All the evaluations happened after the approval of the Human Research Ethics Committee of the Universidade Federal do Rio Grande do Sul (UFRGS, Federal University of Rio Grande do Sul), under the process number 2.571.198, and with free informed consent terms signed by both the children and their legal guardians.

The sample was calculated a posteriori using the software G^*Power version 3.1 [²⁵] for the analyses of the association between eating habits and CRF with the BMI, in multivariate analyses with more than one endpoint measure. We also considered the effect size f²=0,15 (small/medium), the significance level of 0.05, for n=60 and the five predictors involved, resulting in a power of test of 1 – β=0,80 [²⁶].

The eating habits were evaluated using the Food Frequency Survey of the National System of Food and Nutrition Security (SISVAN, Sistema Nacional de Segurança Alimentar e Nutricional) [²⁷]. The questionnaire aims to identify healthy and unhealthy dietary habits using indicators of food consumption and comparing them with the Dietary Guidelines for the Brazilian Population [²⁸]. It considers markers of healthy eating practices (beans, vegetables, fresh leaves and fruit) and unhealthy ones (fried snacks, candies and treats, soda, ultra-processed salty foods). The consumption is classified as frequent when it happens more than five times a week, and unusual or not frequent for less than five times a week. That interpretation is in accordance with the Pesquisa Nacional de Saúde do Escolar (PeNSE, National Research on School Children’s Health), on which the consumption of eating markers is presented in means and frequencies [²⁹].

The Food Frequency Survey (SISVAN) was applied by trained nutritionists with individualized and previously scheduled dates and times, on which the kids and their parents were present. After the data collection, we created a score of eating habits where both the frequent consumption of each marker of healthy habits and the infrequent consumption of each marker of unhealthy habits amounted one point. Each child could obtain a maximum of seven points in this score.

The anthropometric and CRF evaluations happened in the school and were carried out by trained researchers in a date previously scheduled and following the protocols of the Projeto Esporte Brasil (PROESP-BR, Project Sports Brazil) [³⁰]. For the anthropometric measures, the kids were oriented to come barefooted and wearing light clothing. An anthropometric scale with a precision of 500 grams was used to determine the body mass, and the height was determined with a measuring tape. Afterwards, the BMI was calculated with the following formula: BMI=weight/height² (Kg/m²) [²⁹]. The BMI was classified by age in a Z-score, in accordance with the World Health Organization (WHO) and this classification was the basis for the calculation of the overweight or obesity frequency [³¹].

The CRF was assessed with the six-minute run/walk test, according to PROESP-BR, and was executed by a team of trained evaluators [³⁰]. During the test, students were organized in small groups which were positioned in a multi-sports court and oriented to go round the court as many times as possible during the six minutes. At the end, the distances travelled were registered in meters [³⁰].

To determine the cardiometabolic risk factors, blood from the participants was drawn and analyzed. The evaluation happened in the research laboratory of the Escola de Educação Física, Fisioterapia e Dança (ESEFID/UFRGS, School of Physical Education, Physiotherapy, and Dance) after a twelve-hour fasting period, with disposable material, and in the presence of the child’s parents or legal guardians. The blood samples were centrifuged and plasma and serum were aliquoted and frozen to -80°C until the analysis. The concentrations of HDL-C and glucose were analyzed with the automatic colorimetric method (Cobas C111, Roche, Basel, Switzerland). The Low-Density Lipoprotein (LDL-C) was determined by the equation proposed by Friedewald et al. [³²]. The concentrations of insulin, leptin, adiponectin, and CRP were determined by ELISA using commercial kits (DRG International, Springfield, USA and Abcam, Cambridge, UK).

The evaluation of Systolic (SBP) and Diastolic Blood Pressures (DBP) happened previously to the blood collection and was performed with an automatic monitor of blood pressure (Omron Digital Hem-7130), with different armbands according to the circumference of the child’s right arm. Children had to be seated for at least five minutes and have their arms in a resting position. The first and second measurements were made after 5 and 10 minutes resting. The means of these two measurements was used for the data analysis.

For the analysis of the descriptive data, we first performed a visual inspection using histograms of normality curves, dispersion diagrams, histograms, and Kolmogorov-Smirnov tests. An independent t-test was carried out to describe possible previous differences between the sexes in all continuous variables. We also considered the means and standard deviation for age, body mass, height, BMI, CRF, eating habits’ score, systolic blood pressure, diastolic blood pressure, adiponectin, CRP, insulin HDL-C, LDL-C, and glucose.

To verify the possible associations between the BMI, CRF, eating habits, and cardiometabolic risk factors, the models were adjusted for sex and age, and the direct and indirect relations were analyzed using generalized estimating equations, in a modeling of multivariate analysis with more than one endpoint measure. We considered the smallest values of Akaike and Bayesian Information Secuteron in Bayesian parameters as indicators of the best model. The final results of this analysis were expressed accordingly to a pathways diagram (MUNROS) [³³]. All the analysis were carried out with the software IBM SPSS [³⁴], AMOS, and Excel, considering an alpha of 5%.

RESULTS

The descriptive categories are presented by sex in Table 1. It is noteworthy that boys present higher average values of HDL-C (p=0.04) and adiponectin (p=0.04) compared to girls. As to their eating habits, the average score was 4.05 (±1.5) in the maximum scale of 7 points. For the markers of healthy eating, we identified a high consumption of fruits in 61.0% of the children, vegetables in 59.5%, and beans in 71.3%. For the markers of unhealthy eating, 48.3% of the children often had ultra-processed foods, 41.3% usually had soda, 69.2% candies, and 14.5% fried snacks.

Table 1
Characterization of the sample according to sex. Porto Alegre, Brasil, 2019.

	Male (n=27)					Female (n=33)
		Means		SD		Means		SD		T		DF		p
Age (years)		9.00		1.35		8.00		1.41		-0.42		58.0		0.67
Body mass (kg)		36.00		9.57		37.57		11.93		-0.51		58.0		0.60
Height (cm)		138.00		8.17		137.00		10.74		-0.39		58.0		0.69
BMI (kg/m2)		18.72		4.04		19.49		4.21		-0.71		58.0		0.47
		n		%		n		%
Overweight		3		011.10		8		024.20
Obesity		9		033.33		10		030.30
		Means		SD		Means		SD		T		DF		p
CRF (m)		799.52		166.74		737.85		101.34		-1.68		41.0		0.10
Eating Score		3.74		1.48		4.30		1.53		-1.43		58.0		0.15
SBP (mmHg)		105.48		14.99		106.12		11.17		-0.18		58.0		0.85
DBP (mmHg)		62.26		9.57		60.85		8.64		-0.59		58.0		0.55
Leptin (ng/mL)		5.02		7.01		6.58		7.36		-0.83		58.0		0.40
Adiponectin (μg/mL)*		8.77		6.44		5.94		3.39		-2.06		37.5		0.04
C-reactive Protein (mg/L)		2.20		1.98		2.59		1.99		-0.73		58.0		0.46
Insulin (uU/mL)		11.30		5.47		13.77		9.69		-1.17		58.0		0.24
HDL-C (mg/dL)*		47.20		10.84		40.38		6.50		-2.87		40.6		0.04
LDL-C (mg/dL)		87.89		24.15		86.83		24.03		-0.17		58.0		0.86
Glucose (mg/dL)		92.64		4.55		92.51		7.17		-0.08		54.8		0.92

• Note: Overweight and Obesity prevalence, according to the WHO.
• ^*
  Sex differences (independent t test; p<0,05); BMI: Body Mass Index; CRF: Cardiorespiratory Fitness; DBP: Diastolic Blood Pressure; DF: Degress of Freedom; DL-C: High-Density Lipoprotein Cholesterol; LDL-C: Low-Density Lipoprotein Cholesterol; SBP: Systolic Blood Pressure; T: Student’s t Test; SD: Standard Deviation.

Figure 1 presents the total and direct relations between eating habits, CRF, BMI, and cardiometabolic risk factors. The analysis performed with a multivariate generalized linear model shows that the eating habits and CRF explain 20% of the BMI. The cardiometabolic risk factors are explained by the relations between the eating habits, CRF, and BMI according to the following percentages: 29% (SBP), 18% (DBP), 63% (leptin), 4% (adiponectin), 14% (CRP), 17% (insulin), 10% (HDL-C), 1% (LDL-C), 4% (glucose).

Figure 1
Relations between the eating habits and cardiometabolic risk factors mediated by the body mass index and cardiorespiratory fitness. Note: Results adjusted for age and sex; β: Beta values standardized in Z-scores; α: Level of statistical significance, alfa below 0,05^**; R: Squared multiple correlation level. AIC: Akaike Information Criterion; BIC: Bayesian Information Criterion; BMI: Body Mass Index; CRF: Cardiorespiratory Fitness; CRP: C-Reactive Protein; DBP: Diastolic Blood Pressure; HDL-C: High-Density Lipoprotein Cholesterol; LDL-C: Low-Density Lipoprotein Cholesterol; SBP: Systolic Blood Pressure.

However, Table 2 shows that the impact of the eating habits in cardiometabolic risk factors is indirect and dependent on the alterations in the BMI and CRF levels. That suggests a singly multivariate effect of the eating habits, BMI, and CRF in children’s cardiometabolic risk factors. We also identified direct relations between the BMI and the cardiometabolic risk factors as SBP (β:0.538; p:0.001) DBP (β:0.429; p:0.002), leptin (β:0.793; p:0.001), CRP (β:0.372; p:0.007), insulin (β:0.418; p:0.001), and HDL-C (β:-0.318; p:0.006).

Table 2
Direct and indirect relations between eating habits and factors for cardiometabolic risks mediated by the body mass index and cardiorespiratory fitness.

Direct relations
				β		p
Eating habits		CRF		0.168		0.199
CRF		BMI*		-0.366		0.001
Eating habits		BMI*		-0.212		0.081
	Direct effects
Variables	BMI
		β		p
SBP*		-0.538		0.001
DBP*		-0.429		0.002
Leptin*		-0.793		0.001
Adiponectin		-0.194		0.248
CRP*		-0.372		0.007
Insulin*		-0.418		0.001
HDL-C*		-0.318		0.006
LDL-C		-0.082		0.495
Glucose		-0.197		0.069
	Indirect effects
Variables	Eating Habits
		β		p
IMC		-0.061		0.141
LDL		-0.022		0.317
Glucose		-0.054		0.065
HDL*		-0.087		0.026
Insulin*		-0.114		0.016
PCR*		-0.102		0.029
Adiponectin		-0.053		0.119
Leptin*		-0.217		0.031
DBP*		-0.117		0.023
SBP*		-0.147		0.023
	Indirect effects
Variables	CRF
		β		p
LDL		-0.030		0.433
Glucose*		-0.072		0.049
HDL*		-0.116		0.004
Insulin*		-0.153		0.001
CRP*		-0.136		0.004
Adiponectin		-0.071		0.143
Leptin*		-0.290		0.001
DBP*		-0.157		0.001
SBP*		-0.197		0.001

• Note: n=60;
• ^*
  Significant difference (p<0.05); β: Beta values standardized in Z-scores.
• BMI: Body Mass Index; CRF: Cardiorespiratory Fitness; CRP: C-Reactive Protein; DBP: Diastolic Blood Pressure; HDL-C: High-Density Lipoprotein Cholesterol; LDL-C. Low-Density Lipoprotein Cholesterol; SBP: Systolic Blood Pressure.

DISCUSSION

The present study aimed to verify the multivariate relations between eating habits, CRF, BMI, and cardiometabolic risk factors in children. Its main results suggest that the relations between eating habits and risk factors were dependent on the BMI and CRF. Thus, for a positive relation with better cardiometabolic health levels, children depend on positive changes in their eating habits, reduction of the BMI values, and increased levels of CRF.

The literature broadly suggests that adequate eating habits are strictly related to a proper nutritional state [¹⁰,³⁵]. Therefore, the results of this study, in which the relations of eating patterns and cardiometabolic risk factors was dependent on the BMI values, highlight the multivariate relation of those factors for the age group studied. Such results are probably explained by the indirect relations of the eating habits with the BMI and consequently, of the latter with the risk factors for cardiometabolic diseases.

In the same approach, we observe that improved CRF levels are associated with lower BMI values and contribute conjointly for a lower cardiometabolic risk in children of school age. These results are in agreement with the literature, since adequate CRF and BMI values were associated with a decreased risk for the development of cardiometabolic diseases [⁶,²⁰,²²,³⁶,³⁷]. Notwithstanding, the most important result in this study in relation to previous research is the difficulty in finding associations between eating habits and cardiometabolic risk factors for the early ages. The data considered in our research suggests that such an effect exists. However, it is dependent on the BMI and the CRF, highlighting the relevance of multivariate analyses for understanding these variables when aggregated. In the same sense, Agostinis-Sobrinho et al. [¹²], stress that evaluating the possible associations between cardiometabolic risk factors and muscular fitness requires considering the eating habits, which might have a confounder effect, mitigating inflammatory processes.

The CRF did not present a direct relation with the cardiometabolic risk factors. That relation depended on the BMI. In that sense, children with better CRF and lower BMI values also presented lower cardiometabolic risk. Other studies sought to clarify these relations, showing that improved CRF levels reduce cardiometabolic risk factors in children with higher BMI values. However, it is important to highlight that this occurs when the comparison examines overweight/obese children. When overweight/obese children are compared with children with adequate weights, such influence of the CRF does not hold. [⁶,¹⁸,²⁰].

Some authors also suggest that better CRF levels might constrict the hazards of a profile with metabolic risks, as obese and overweight children who have better CRF levels were found to have lower risks in that sense [²⁰,²²]. Moreover, the risk was even lower when the BMI and the physical fitness were adequate. These results support other studies that suggest that good CRF levels might work to attenuate obesity’s harmful effects in children and teenagers [²¹,²²,³⁸].

Thus, it is proven that CRF is a predictor of cardiovascular risk, metabolic syndrome, and general health [⁹,¹⁶]. As our findings show, it might also act as a mediator of the relations between eating habits, obesity, and cardiometabolic risk.

In short, eating habits and CRF explain 20% of the BMI and are important factors in the relation with cardiometabolic risk. Besides, the eating habits, CRF, and BMI might explain 29% of the SBP values, 18% for the DBP, 63% for leptin, and 17% for insulin, and are therefore determinant in children’s metabolic profile.

Thus, intervention programs that foster the adoption of better eating habits and CRF levels will also favor improved nutritional states and consequently, lower cardiometabolic risk. We stress the importance of stimulating the consumption of fresh food, fruits, vegetables, and cereals, as well as of reducing the consumption of industrialized foods, in order to achieve adequate energy balance, which is fundamental for weight control and obesity treatment [³⁹,⁴⁰]. Additionally, physical exercises are crucial for the improvement of CRF. In that sense, moderate-intensity physical activity, sports, and even a significative involvement in Physical Education classes are effective [¹³,⁴¹-⁴⁴]. Thus, we highlight the importance of contributing with the development of physically active children who meet the recommendations of the World Health Organization of 60 minutes of moderate or vigorous physical activity every day [⁴⁵].

As an innovative point, our results show that, together, the analyzed variables (CRF and eating habits) associate with overweight and obesity and that they are the main risk factors for cardiometabolic diseases and inflammatory markers since childhood. We were able to observe that behavior in a multivariate analysis pointing to the role of each variable in the relation with cardiometabolic diseases and inflammatory markers in children. Nevertheless, our study presents some limitations. Among them, we call attention to the impossibility of treating cause and effect when presenting the relation between the variables, as these variables are obtained in a transversal study. It is important to inform, though, that the sample calculation was carried out afterwards and considering only small and medium effect sizes, thus a larger number of subjects would be necessary to detect mathematically weak but clinically important associations. Nevertheless, we were very careful with the effect sizes and the relevance of each of them considering the relevance of the values in a clinical perspective.

CONCLUSION

The relation between eating habits and cardiometabolic risk factors in children is dependent on the CRF and the BMI. Therefore, the precocious stimulation of healthy lifestyles, including healthy eating habits and the regular practice of physical activity, is fundamental for good CRF levels. Adequate nutritional states and better metabolic indicators will ensue as a consequence of these behaviors. Indeed, our findings suggest a multivariate relation among those factors, indicating the importance of public health interventions and policies on all those aspects.

ACKNOWLEDGMENTS

We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, National Council for Scientific and Technological Development) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Coordination for the Improvement of Higher Education Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the financial support for the realization of this study.

How to cite this article

• Duarte Junior MAS, Gaya ACA, Lemes VB, Fochesatto CF, Brand C, Gaya AR. Association between eating habits, body mass index, cardiorespiratory fitness, and cardiometabolic risk factors in children. Rev Nutr. 2021;34:e200116. https://doi.org/10.1590/1678-9865202134e200116

• Support:

  Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, National Council for Scientific and Technological Development) (Process n. 401969/2016-9); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Coordination for the Improvement of Higher Education Personnel).
• Article elaborated from the dissertation by MAS DUARTE JUNIOR, entitled “A associação dos hábitos alimentares e aptidão cardiorrespiratória com o estado nutricional e risco cardiovascular em crianças”. Universidade Federal do Rio Grande do Sul, 2019.

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Publication Dates

• Publication in this collection
  03 Feb 2021
• Date of issue
  2021

History

• Received
  29 May 2020
• Reviewed
  03 Sept 2020
• Accepted
  03 Nov 2020