Yoddumnern-Attig, B., Guest, P., Thongthai, V., Punpuing, S., Sethaput, C., Jampaklay, A., Gray, R., & Vorasiriamorn, Y. (2008). The Relevance of Longitudinal Research for Population and Health. Journal of Population and Social Studies [JPSS], 16(2), 1–34. Retrieved from https://so03.tci-thaijo.org/index.php/jpss/article/view/84568