Bastos, S.; Bonfim, J. R. de A.; Kalckmann, S.; Figueiredo, R.; Fernandes, M. E. L. Prevention of Sexually Transmitted Diseases and Acquisition of Emergency Contraception at Pharmacies in the City of São Paulo . Saúde Soc. 2009, 18 (4), 787-799. https://doi.org/10.1590/S0104-12902009000400021.