Kayani, A.; Khan, R. .; Siddiqui, T. S. .; Rehman, A. U. .; Ahmed, R.; Khan, Y. . Hysterosalpingographic Pattern of Primary Sub-Fertility and Secondary Sub-Fertility In   Women of Reproductive Age. Pak Armed Forces Med J 2024, 74 (5), 1251-1254. https://doi.org/10.51253/pafmj.v74i5.5394.