Leerasiri, Pichai, and Manee Rattanachaiyanont. “Pregnancy of Unknown Location: A Review with Demonstration of 3 Cases”. Siriraj Medical Journal 59, no. 2 (February 1, 2007): 89–92. accessed September 19, 2026. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246036.