Islam, Farzana, Shakeela Ishrat, Parveen Fatima, Shaabati Dey, Rowshan Ara, and Eva Rani Nandi. 2022. “Vitamin D Deficiency in Infertile Males With Oligospermia: A Cross-Sectional Comparative Study”. Journal of Bangladesh College of Physicians and Surgeons 40 (4):253-56. https://doi.org/10.3329/jbcps.v40i4.61877.