H. Situmorang and D. Radityo, “External Validation of Endometriosis Fertility Index (EFI) in an Indonesian Population: A TwoCentre Prospective Study: Validasi Eksternal Endometriosis Fertility Index (EFI) pada Populasi Indonesia: Sebuah Studi Prospektif”, Indones J Obstet Gynecol, vol. 5, no. 3, pp. 160–163, Nov. 2017.