Hansen KR, Eisenberg E, Baker V, Hill MJ, Chen S, Talken S, Diamond MP, Legro RS, Coutifaris C, Alvero R, Robinson RD, Casson P, Christman GM, Santoro N, Zhang H, Wild RA. Midluteal Progesterone: A Marker of Treatment Outcomes in Couples With Unexplained Infertility. J Clin Endocrinol Metab. 2018 07 01; 103(7):2743-2751.