Siriwachirachai, T., & Piriyasupong, T. (2012). Effect of Dydrogesterone on Treatment of Threatened Miscarriage: A Systematic Review and Meta-Analyses. Thai Journal of Obstetrics and Gynaecology, 19(3), 97–104. retrieved from https://he02.tci-thaijo.org/index.php/tjog/article/view/1239