Bhutia, Pema Choden, Triphop Lertbunnaphong, Thanyarat Wongwananuruk, and Dittakarn Boriboonhirunsarn. 2020. “Prevalence of Pregnancy With Placenta Previa in Siriraj Hospital”. Siriraj Medical Journal 63 (6):191-95. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/241010.