1. Family Planning U. Infertility: a tabulation of available data on prevalence of primary and secondary infertility;World Health Organization Programme of,1991
2. Office evaluation of the subfertile male;Sigman,2009
3. Time to pregnancy: results of the German prospective study and impact on the management of infertility;Gnoth;Hum Reprod,2003
4. Diagnosis and treatment of infertility in men: AUA/ASRM guideline Part I;Schlegel;J Urol,2021
5. Definitions of infertility and recurrent pregnancy loss: a committee opinion;Fertil Steril,2013