@article{almeida_goulart_2017,  title={How to avoid bias in systematic reviews of observational studies},  volume={19},  ISSN={1516-1846},  url={https://doi.org/10.1590/1982-021620171941117},  DOI={10.1590/1982-021620171941117},  number={4},  journal={Revista CEFAC},  publisher={ABRAMO Associação Brasileira de Motricidade Orofacial},  author={Almeida, Carlos Podalirio Borges de and Goulart, Bárbara Niegia Garcia de},  year={2017},  month={Jul},  pages={551–555} }