title: A randomized trial of vas occlusion versus vasectomy for male contraception.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D003267:Contraception; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011897:Random Allocation; D013076:Sperm Count; D013243:Sterilization Reversal; D014649:Vas Deferens / Q000601:surgery*; D014659:Vasectomy