The role of internal sphincterotomy.
D000328:Adult; D000368:Aged; D001003:Anal Canal / Q000601:surgery*; D001004:Anus Diseases / Q000601:surgery*; D003248:Constipation / Q000150:complications; D005260:Female; D006484:Hemorrhoids / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014456:Ulcer / Q000601:surgery*