@article{birn_2011,  title={Small(pox) success?},  volume={16},  ISSN={1413-8123},  url={https://doi.org/10.1590/S1413-81232011000200022},  DOI={10.1590/S1413-81232011000200022},  number={2},  journal={Ciência & Saúde Coletiva},  publisher={ABRASCO - Associação Brasileira de Saúde Coletiva},  author={Birn, Anne-Emanuelle},  year={2011},  month={Feb},  pages={591–597} }