Wanapirak, C., Tongsong, T., Sirivatanapa, P., Piyamongkol, W., Sirirchotiyakul, S., Yampochai , A., Tuggapijit, A., & Sekararithi , R. (1997). Midtrimester Amniocentesis : Experience of 2040 cases . Thai Journal of Obstetrics and Gynaecology, 9(4), 269–275. retrieved from https://he02.tci-thaijo.org/index.php/tjog/article/view/257204