Wangroongsarb, Piyada, Watson Kortporm, Wimol Petkanjanapong, and Pimjai Naigowit. 2001. “Prevalence of Antibody to Chlamydophila pneumoniae in children”. Archives of Allied Health Sciences 13 (3). Khon Kaen, Thailand:192-99. https://he01.tci-thaijo.org/index.php/ams/article/view/65952.