Variability of sperm disappearance from the ejaculate after vasectomy.
D000328:Adult; D002452:Cell Count; D002465:Cell Movement; D004542:Ejaculation; D005837:Genitalia, Male / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D012661:Semen / Q000166:cytology*; D013094:Spermatozoa; D013245:Sterilization, Reproductive; D013997:Time Factors