Igbokwe, Martin, et al. “Tissue Zinc Concentration in Prostate Cancer: Relationship With Prostate Specific Antigen and Gleason Score in a Cohort of Nigerian Men”. Asian Pacific Journal of Cancer Biology, vol. 6, no. 2, June 2021, pp. 147-53, doi:10.31557/apjcb.2021.6.2.147-153.