Alkaf, S. et al. 2016. Progesterone Receptor Gene Polymorphism Promoter Region +331G/A Increases Risk of Endometriosis. Indonesian Journal of Obstetrics and Gynecology. 4, 1 (Jan. 2016), 52–56. DOI:https://doi.org/10.32771/inajog.v4i1.73.