Why have Birth Rates Dropped? For Medical Reasons?

Eberhard Nieschlag, Male Contribution to Contraception Andrology. pp. 557- 564 ,(2010) , 10.1007/978-3-540-78355-8_27

Elizabeth Hervey Stephen, Anjani Chandra, Declining estimates of infertility in the United States: 1982-2002. Fertility and Sterility. ,vol. 86, pp. 516- 523 ,(2006) , 10.1016/J.FERTNSTERT.2006.02.129

Thomas H. Scheike, Lars Rylander, Lisbeth Carstensen, Niels Keiding, Tina Kold Jensen, Ulf Stromberg, Michael Joffe, Olof Akre, Time trends in human fecundability in Sweden. Epidemiology. ,vol. 19, pp. 191- 196 ,(2008) , 10.1097/EDE.0B013E31816334AD

A. Lerchl, E. Nieschlag, Decreasing sperm counts? A critical (re)view. Experimental and Clinical Endocrinology & Diabetes. ,vol. 104, pp. 301- 307 ,(2009) , 10.1055/S-0029-1211458

Tina Kold Jensen, Mike Joffe, Thomas Scheike, Axel Skytthe, David Gaist, Kaare Christensen, Time trends in waiting time to pregnancy among Danish twins Human Reproduction. ,vol. 20, pp. 955- 964 ,(2005) , 10.1093/HUMREP/DEH723

Hiltrud Merzenich, Hajo Zeeb, Maria Blettner, Decreasing sperm quality: a global problem? BMC Public Health. ,vol. 10, pp. 24- 24 ,(2010) , 10.1186/1471-2458-10-24

Mohamed A.M Hassan, Stephen R Killick, Effect of male age on fertility: evidence for the decline in male fertility with increasing age Fertility and Sterility. ,vol. 79, pp. 1520- 1527 ,(2003) , 10.1016/S0015-0282(03)00366-2

Wayne JG Hellstrom, James W Overstreet, Suresh C Sikka, Jonathan Denne, Sanjeev Ahuja, Amy M Hoover, Gregory D Sides, William H Cordell, L Mark Harrison, J Steven Whitaker, None, Semen and Sperm Reference Ranges for Men 45 Years of Age and Older Journal of Andrology. ,vol. 27, pp. 421- 428 ,(2006) , 10.2164/JANDROL.05156

E. Carlsen, A. Giwercman, N. Keiding, N. E. Skakkebaek, Evidence for decreasing quality of semen during past 50 years. BMJ. ,vol. 305, pp. 609- 613 ,(1992) , 10.1136/BMJ.305.6854.609

T. G. Cooper, L. Bjorndahl, J. Vreeburg, E. Nieschlag, Semen analysis and external quality control schemes for semen analysis need global standardization. International Journal of Andrology. ,vol. 25, pp. 306- 311 ,(2002) , 10.1046/J.1365-2605.2002.00370.X