Sperm counts in fertile and infertile men.
D002452:Cell Count; D005298:Fertility; D006801:Humans; D007248:Infertility, Male / Q000473:pathology*; D008297:Male; D009845:Oligospermia / Q000473:pathology; D012306:Risk; D013094:Spermatozoa / Q000166:cytology*; D014659:Vasectomy