@article{costa_ceolim_neri_2011,  title={Sleep problems and social support: Frailty in a Brazilian Elderly Multicenter Study},  volume={19},  ISSN={0104-1169},  url={https://doi.org/10.1590/S0104-11692011000400010},  DOI={10.1590/S0104-11692011000400010},  number={4},  journal={Revista Latino-Americana de Enfermagem},  publisher={Escola de Enfermagem de Ribeirão Preto / Universidade de São Paulo},  author={Costa, Shintia Viana da and Ceolim, Maria Filomena and Neri, Anita Liberalesso},  year={2011},  month={Jul},  pages={920–927} }