@article{ferrer_marcon_santana_2008,  title={Hospital morbidity among elderly patients, before and after influenza vaccination in the state of Paraná},  volume={16},  ISSN={0104-1169},  url={https://doi.org/10.1590/S0104-11692008000500006},  DOI={10.1590/S0104-11692008000500006},  number={5},  journal={Revista Latino-Americana de Enfermagem},  publisher={Escola de Enfermagem de Ribeirão Preto / Universidade de São Paulo},  author={Ferrer, Ana Lúcia Mendes and Marcon, Sonia Silva and Santana, Rosangela Getirana},  year={2008},  month={Sep},  pages={832–837} }