S. P. Paiva and E. R. Brandão, “ Commercialization of emergency contraception in a drugstore in the city of Rio de Janeiro: ethical and methodological aspects of an ethnographic research ”, Saúde Soc., vol. 23, no. 4, pp. 1417–1430, Dec. 2014, doi: 10.1590/S0104-12902014000400024.