@article{viacava_souza-júnior_szwarcwald_2005,  title={Coverage of the Brazilian population 18 years and older by private health plans: an analysis of data from the World Health Survey},  volume={21},  ISSN={0102-311X},  url={https://doi.org/10.1590/S0102-311X2005000700013},  DOI={10.1590/S0102-311X2005000700013},  journal={Cadernos de Saúde Pública},  publisher={Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz},  author={Viacava, Francisco and Souza-Júnior, Paulo Roberto Borges de and Szwarcwald, Célia Landmann},  year={2005},  pages={S119–S128} }