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Wong, W. Y., Merkus, H. M. W. ., Thomas, C. M. ., Menkveld, R., Zielhuis, G. A., & Steegers-Theunissen, R. P. . (2002). Effects of folic acid and zinc sulfate on male factor subfertility: a double-blind, randomized, placebo-controlled trial. Fertility and Sterility, 77(3), 491–498. doi:10.1016/s0015-0282(01)03229-0 
10.1016/S0015-0282(01)03229-0