title: How far does the proctosigmoidoscope reach? A prospective study of 1000 patients.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011187:Posture; D011446:Prospective Studies; D012737:Sex Factors; D012812:Sigmoidoscopy / Q000009:adverse effects / Q000379:methods*; D013997:Time Factors