จิรวัฒน์กุล อ. Statistical Test and Calculation of Sample Size in Cross-sectional Surveys. Journal of Health Science of Thailand, [S. l.], v. 15, n. 6, p. 823–24, 2021. Disponível em: https://thaidj.org/index.php/JHS/article/view/10370. Acesso em: 6 dec. 2025.