The research protocol V: The calculation of sample size. Revista Alergia México, [S. l.], v. 64, n. 2, p. 220–227, 2017. DOI: 10.29262/ram.v64i2.267. Disponível em: https://www.revistaalergia.mx/ojs/index.php/ram/article/view/267. Acesso em: 24 sep. 2026.