Paritakul, Panwara. “Ruptured Tubal Pregnancy with a Negative Urine Pregnancy Test and Serum Beta Human Chorionic Gonadotropin”. Thai Journal of Obstetrics and Gynaecology 25, no. 2 (June 30, 2017): 130–135. accessed September 26, 2026. https://he02.tci-thaijo.org/index.php/tjog/article/view/48007.