CHIRAWATKUL, A. Appropriateness of Using Cluster Sampling in Risk Factors Study. Journal of Health Science of Thailand, [S. l.], v. 22, n. 3, p. 381–382, 2017. Disponível em: https://www.thaidj.org/index.php/JHS/article/view/852. Acesso em: 10 dec. 2025.