Boonruang, Photjana, Arinporn Imruetaicharoenchok, Preeyaporn Jirakittidul, and Budsaba Wiriyasirivaj. 2013. “Serum CA-125 in Normal First Trimester of Pregnancy and Ectopic Pregnancy”. Thai Journal of Obstetrics and Gynaecology 21 (4). Bangkok, Thailand:150-55. https://he02.tci-thaijo.org/index.php/tjog/article/view/12103.