Unpikool, Atiwat, Chayamak Sareeborvornthanasak, and Sutida Sonbankoh. 2019. “Placental Sites and Preeclampsia in Singleton Pregnancy: A Retrospective Cohort Study”. The Clinical Academia 43 (2):44-53. https://he02.tci-thaijo.org/index.php/theclinicalacademia/article/view/182144.