The placebo as an ethical problem in clinical research. Diametros, [S. l.], n. 19, p. 132–136, 2009. DOI: 10.13153/diam.19.2009.337. Disponível em: https://diametros.uj.edu.pl/diametros/article/view/337. Acesso em: 7 aug. 2026.