Rahman, M.T. et al. 2013. Serum Zinc, Total & Free PSA, Free/Total PSA Ratio and Prostate Cancer Association: A Case Control Study. Anwer Khan Modern Medical College Journal. 4, 1 (Feb. 2013), 15–19. DOI:https://doi.org/10.3329/akmmcj.v4i1.13679.