M. Irani, M. Amirian, R. Sadeghi, J. L. Lez, and R. Latifnejad Roudsari, “The Effect of Folate and Folate Plus Zinc Supplementation on Endocrine Parameters and Sperm Characteristics in Sub-Fertile Men: A Systematic Review and Meta-Analysis”, Urol J, vol. 14, no. 5, pp. 4069–4078, Aug. 2017.