Rattanakanokchai, S., M. Laopaiboon, U. Sangkomkamhang, and P. Pattanittum. “Risk of Progesteronefor Preventing Preterm Delivery on Gestational Diabetes Mellitus: A Systematic Review and Meta-Analysis”. Srinagarind Medical Journal, vol. 31, no. 6, Jan. 2017, pp. 355-64, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/75273.