Chowchuen, Bowornsilp, and Keith Godfrey. 2013. “Investigating the Occurrences of Cleft Lip, Cleft Palate and Other Related Birth Defects”. Srinagarind Medical Journal 16 (1):27-36. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/14259.