I'm a guy; isn't this a woman's issue? Protect Your Fertility website. Available at: http://www.protectyourfertility.org/malerisks.html. Accessed October 27, 2014.
Infertility in men. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated October 7, 2014. Accessed October 27, 2014.
Jorgensen N, Carlsen E, Nermoen I, et al. East-West gradient in semen quality in the Nordic-Baltic area: a study of men from the general population in Denmark, Norway, Estonia and Finland. Hum Reprod. 2002;17:2199.
Reproductive health and the workplace. The National Institute for Occupational Safety and Health website. Available at: http://www.cdc.gov/niosh/topics/repro. Updated June 10, 2014. Accessed October 27, 2014.
Swan SH, Brazil C, Drobnis EZ, et al. Geographic differences in semen quality of fertile US males. Environ Health Perspect. 2003;111:414.
9/2/2009 DynaMed Systematic Literature Surveillance http://www.ebscohost.com/dynamed: Ghanem H, Shaeer O, El-Segini A. Combination clomiphene citrate and antioxidant therapy for idiopathic male infertility: a randomized controlled trial. Fertil Steril. 2009 Mar 5. [Epub ahead of print]
2/14/2011 DynaMed's Systematic Literature Surveillance http://www.ebscohost.com/dynamed: Showell M, Brown J, Yazdani A, Stankiewicz M, Hart R. Antioxidants for male subfertility. Cochrane Database Syst Rev. 2011;(1):CD007411.