It seems simple: an egg + sperm = one embryo. But if your sperm is "few, vague and abnormal" and your woman is premenopausal at age 37, things start to get complicated.
1979
2004
1993
1953
2006
2013
2012
2015
2017
1999
2019
2007
2016
1995
1927
1996
1932
