Chandanabodhi, S. ., . K. . Boontan, and G. Chiravacharadej. “Birth Control in Married Women : Study in Postpartum Women at Siriraj Hospital”. Siriraj Medical Journal, vol. 55, no. 10, Oct. 2003, pp. 599-04, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245451.