1. World Health Organization (WHO). Infertility: a tabulation of available data on prevalence of primary and secondary infertility. Geneva: WHO; 1991.
2. Tielemans E, Burdorf A, Te Velde E, et al. Sources of bias in studies among infertility clients. Am J Epidemiol. 2002;156:86–92.
3. Turek PJ. Male infertility. In: Tanagho EA, McAninch JC, editors. Smith’s urology. 16th ed. Stamford: Appleton & Lange; 2008.
4. Russell L. Sertoli-germ cell interactions: a review. Gamete Res. 1980;3:179.
5. Steinberger E, et al. Molecular mechanisms concerned with hormonal effects on the seminiferous tubule and endocrine relationships at puberty in the male. CH Spilman TJ Lobl KT Kirton et al. Regulatory mechanisms of male reproductive physiology. Excerpta Med Amsterdam. 1976;6:29–34.