@article{ferreira_patino_2019,  title={Loss to follow-up and missing data: important issues that can affect your study results},  volume={45},  ISSN={1806-3713},  url={https://doi.org/10.1590/1806-3713/e20190091},  DOI={10.1590/1806-3713/e20190091},  number={2},  journal={Jornal Brasileiro de Pneumologia},  publisher={Sociedade Brasileira de Pneumologia e Tisiologia},  author={Ferreira, Juliana Carvalho and Patino, Cecilia Maria},  year={2019},  pages={e20190091} }