@article{santos_guedes_barbosa_cruz_2012,  title={Sleeping difficulties reported by patients with heart failure},  volume={20},  ISSN={0104-1169},  url={https://doi.org/10.1590/S0104-11692012000400003},  DOI={10.1590/S0104-11692012000400003},  number={4},  journal={Revista Latino-Americana de Enfermagem},  publisher={Escola de Enfermagem de Ribeirão Preto / Universidade de São Paulo},  author={Santos, Mariana Alvina dos and Guedes, Erika de Souza and Barbosa, Ricardo Luís and Cruz, Diná de Almeida Lopes Monteiro da},  year={2012},  month={Jul},  pages={644–650} }