Souza Leite Campinas, Lúcia de Lourdes, and Vera Lúcia de Barros. “The Free and Informed Consent Statement and Its Different Ways of Expressing the Research Subject’s Authorized Consent: DOI: 10.15343 0104-7809.200630.3.12”. O Mundo Da Saúde, vol. 30, no. 3, July 2006, pp. 471-9, https://revistamundodasaude.emnuvens.com.br/mundodasaude/article/view/703.