Irani, M.; Amirian, M.; Sadeghi, R.; Lez, J. L.; Latifnejad Roudsari, R. 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 2017, 14, 4069-4078.