Main biases in clinical research. Revista Alergia México, [S. l.], v. 68, n. 4, p. 291–299, 2021. DOI: 10.29262/ram.v68i4.1003. Disponível em: https://ojs.revistaalergia.mx/ojs/index.php/ram/article/view/1003. Acesso em: 23 sep. 2026.