1. Articles that are not in accordance with the following guidelines
will be returned to the authors for correction before being sent to peer
2. Manuscripts submitted to Trends should not have been published elsewhere
in whole or in part and should not have been or be submitted simultaneously
for publication in any other journal(s). Previous presentation of the
manuscript as abstract or poster at scientific meetings (conferences,
workshops, etc.) is allowed, but should be informed on the title page.
3. All authors must have actively participated in the study conception
and design, analysis and interpretation of data, and drafting or critical
revision of the manuscript. In addition, all authors must have read and
approved the final version of the text.
4. Copyright of all published material becomes the property of Trends,
and reproduction of the text in whole or in part is forbidden without
written permission from the editors. The opinions and statements contained
in the papers are entirely the responsibility of the authors.
5. The journal is published both in print and online at Scielo.
6. One author should be identified as the corresponding author, and his/her
full postal address (including ZIP code), phone and fax numbers, and e-mail
address should be informed.
7. The cover letter and the title page should disclose any potential conflicts
of interest associated with the publication of the article (e.g., professional
or financial conflicts and/or direct or indirect benefits).
8. Anonymity should be preserved in clinical trials, and the authors should
clearly describe, in the methodology section, the existence and use of
a consent form, as well as approval of the study protocol by the ethics
committee of the institution where the study was carried out. A statement
informing that the trial was registered in one of the Clinical Trials
Registries recommended by the WHO and the ICMJE (addresses are available
should also be included. This information should appear on the cover letter
and title page.
9. Articles should be typed using a PC-compatible word processor (Word
or similar) on A4 paper, size 12 Arial font, double-spaced (including
tables and references), with 3-cm margins on all sides. All pages should
Conflicts of interest
All authors are requested to disclose any actual or potential conflict of interest concerning the publication of the article, including any financial, personal or other relationships with other people or organizations that could inappropriately influence, or be perceived to influence, their work (see detailed examples below). In the absence of conflicts of interest, the following statement should be included in the title page: “The authors declare that they have no competing interests.” If you are unsure, please discuss it with the editorial office.
Examples of financial competing interests
- Reimbursements, fees, funding, or salary received from an organization that may in any way gain or lose financially from the publication of this manuscript, either now or in the future.
- Stock or share holding in an organization that may in any way gain or lose financially from the publication of this manuscript, either now or in the future.
- Reimbursements, fees, funding, or salary from an organization that holds or has applied for patents relating to the content of the manuscript..
Examples of non-financial competing interests
Presence of any political, personal, religious, ideological, academic, intellectual, commercial, or other competing interests in relation to this manuscript.
Types of articles published
1) Editorials: Critical and thorough comments, written by the
editors and/or invited authors with renowned experience in the topic being
2) Original Articles: These articles present original research
data and should contain all the necessary relevant information so as to
enable the reader to repeat the experiment and evaluate results and conclusions.
Original articles should include the following sections: Introduction,
Method, Results, Discussion, Conclusion, and other subtitles, when necessary.
These articles should be up to 6,000 words long and should contain no
more than six tables or figures. These manuscripts should include a structured
abstract with no more than 250 words and subtitles that reflect the text
3) Brief Communications: Original but shorter manuscripts, with
preliminary results or results of immediate relevance. These communications
should be up to 2,000 words long and should include only one table or
figure. The text should be divided into the following sections: Introduction,
Method, Results, and Discussion. These articles should contain a structured
abstract with no more than 200 words and subtitles that reflect the text
4) Review Articles: Systematic and updated reviews about issues
considered to be relevant for the journal's editorial line. These articles
are aimed at reviewing and critically assessing the knowledge available
on a specific topic, including comments on other authors' studies. They
should be up to 7,000 words long, and the number of tables and figures
should not exceed a total of six. There is not a fixed text structure
for these articles, but they should be accompanied by an unstructured
abstract with no more than 250 words.
5) Case Reports: These articles report on professional experience,
involving a unique case or a set of peculiar cases, including brief but
relevant comments considering the activity of other professionals in the
field. Case reports should be up to 1,500 words long. The author should
make all possible efforts to protect the patient's anonymity, without
distorting relevant scientific data. Explicit reference should be made
to the existence of an informed consent form signed by the patient agreeing
with the publication (both in print and electronically), or else the reason
for its absence should be clarified. Case reports should include a structured
abstract with no more than 200 words and the subtitles Objective, Case
description and Comments.
6) Letters to the Editors: Opinions and comments on material published
in the journal, its editorial line, topics of scientific relevance, clinical
observations or new data. The texts should be brief, with no more than
500 words. Only one table and one figure are allowed.
7)Book Reviews: Critical review of recently published books, including
a commented synopsis and opinions so as to provide an overview of the
publication and guide the reader regarding its characteristics and potential
uses. These texts should be brief and written by experts in the field.
Complete bibliographic information on the book should be provided before
the text, and the name, academic degree and affiliation of the author
submitting the book review should be included following the text.
The following information should appear on the title page:
1) title of the article, which should be concise and complete, with the
corresponding translation into Brazilian Portuguese, if possible;
2) short title;
3) names of the authors (typed exactly as they should appear in print),
profession and main affiliation;
4) full address information for every author;
5) name of the department and institution with which the work is associated;
6) identification of the corresponding author, providing full postal address
(including ZIP code), phone and fax numbers, and e-mail address;
7) financial support disclosure, if applicable;
8) conflict of interest statement;
9) information on the use of informed consent and on the approval of the
study protocol by the institution's ethics committee;
10) copyright transfer statement;
11) articles based on academic theses or dissertations should provide
the title of the original work, year and name of the institution where
the work has been presented;
12) papers previously presented at scientific meetings should provide
the name, location and date of the event;
13) word count of main text (not including title page, abstract, references,
14) type of article being submitted (original article, review article,
case report, letter, etc.);
15) date of the last literature review performed by the author(s) on the
Abstract and keywords
After the title page, an abstract should be provided following the word
limits and structure defined for each type of article (see above). Three
to six keywords should be provided following the abstract. Keywords should
be compliant with the Medical Subject Headings (MeSH, http://www.nlm.nih.gov/mesh/meshhome.html),
published by the National Library of Medicine. If possible, a Brazilian
Portuguese translation of the abstract (resumo) and keywords (palavras-chave)
should also be provided; in this case, the palavras-chave should
be compliant with the DeCS database (DeCS - Descritores em Ciências
da Saúde) published by BIREME.
Authors should demonstrate that the statistical procedures employed in
the study were not only appropriate to test the hypotheses of the study
but also correctly interpreted. Levels of statistical significance (e.g.,
p < 0.05, p < 0.01, p < 0.001) should be provided.
Abbreviations should be spelled out in the text at first mention. Thereafter,
only the abbreviation should be used.
Drugs should be referred to by their generic name only.
This section should disclose any sources of financial support received by the study. In addition, this section should acknowledge people, groups or institutions which have made important contributions to the study but do not meet the criteria for authorship (e.g., technical assistance, statistical analysis, writing, etc.).
References should be numbered consecutively in the order in which they are first mentioned in the text, using superscript Arabic numerals, avoiding the use of author names. References cited only in tables or figure legends should be numbered consecutively respecting their first mention in the text.
References should be listed at the end of the article according to their order of citation in the text and should comply with the ICMJE norms. The accuracy of references is the responsibility of the authors, both in the sense of making sure that all works cited in the text appear in the list and vice-versa, and in the sense of respecting the norm.
For journal articles, we adopt the ICMJE format that omits issue number, day and month of publication (only year should be informed).
Example: Halpern SD, Ubel PA, Caplan AL. Solid-organ transplantation in HIV-infected patients. N Engl J Med. 2002;347:284-7.
Tables and figures
Tables should not be submitted as images. Instead, they should be created
using word processor tools specifically designed for this purpose. Do
not underline or draw lines inside the tables. Do not insert spaces to
separate columns. Explanatory notes should be presented as table footnotes,
identified by the following symbols, in this sequence: *, , ,
§, ||, , **, , etc. Tables should be numbered consecutively
using Arabic numerals. Each table should appear on a separate page and
have a concise title. Tables should be cited in the text and should not
duplicate information contained in the text.
Figures (photographs, illustrations, graphs, drawings, etc. - all referred
to as figures) should also be numbered consecutively using Arabic numerals,
and should be submitted as separate files (preferably .tif), with a minimum
resolution of 300 dpi. Photographs should not allow patient identification.
Each figure should include a legend, containing the title of the figure
and explanatory notes when necessary. All figure legends should appear
together on one separate page at the end of the text file.
Previously published tables and figures should be accompanied by written
permission of the copyright holder.