title: How often should patients be sigmoidoscoped? A mathematical perspective.
mesh_terms: D000328:Adult; D003106:Colon / Q000473:pathology; D003110:Colonic Neoplasms / Q000175:diagnosis*; D005188:False Negative Reactions; D006801:Humans; D008433:Mathematics; D008875:Middle Aged; D008954:Models, Biological; D009367:Neoplasm Staging; D012004:Rectal Neoplasms / Q000175:diagnosis; D012007:Rectum / Q000473:pathology; D012811:Sigmoid Neoplasms / Q000175:diagnosis; D012812:Sigmoidoscopy / Q000600:supply & distribution*; D013997:Time Factors