Chirasathaporn , Sangmanee, and Wibool Ruangchainikom. 2001. “Genetic Amniocentesis for Prenatal Diagnosis at Bhumibol Adulyadej Hospital: Four years experience”. Thai Journal of Obstetrics and Gynaecology 13 (3). Bangkok, Thailand:79-83. https://he02.tci-thaijo.org/index.php/tjog/article/view/256561.