@article{barbosa_oliveira_fernandes_2019,  title={Vulnerability of the elderly: a conceptual analysis},  volume={72},  ISSN={0034-7167},  url={https://doi.org/10.1590/0034-7167-2018-0728},  DOI={10.1590/0034-7167-2018-0728},  journal={Revista Brasileira de Enfermagem},  publisher={Associação Brasileira de Enfermagem},  author={Barbosa, Keylla Talitha Fernandes and Oliveira, Fabiana Maria Rodrigues Lopes de and Fernandes, Maria das Graças Melo},  year={2019},  pages={337–344} }