title: Time to azoospermia may be longer than often assumed.
mesh_terms: D003267:Contraception; D003710:Demography; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D011153:Population; D011157:Population Dynamics; D013245:Sterilization, Reproductive; D013997:Time Factors; D014659:Vasectomy
keywords: Contraception; Contraceptive Effectiveness; Demographic Factors; Family Planning; Male Sterilization; Population; Population Dynamics; Sterilization, Sexual; Time Factors; Use-effectiveness; Vasectomy