title: Re: Risk of perforation after colonoscopy and sigmoidoscopy: a population-based study.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Schoen
authors.forename: Theodore R
authors.initials: TR
authors.lastname: Levin
mesh_terms: D003113:Colonoscopy / Q000009:adverse effects*; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans; D007416:Intestinal Perforation / Q000209:etiology*; D008403:Mass Screening / Q000009:adverse effects / Q000379:methods; D018570:Risk Assessment; D012307:Risk Factors; D012812:Sigmoidoscopy / Q000009:adverse effects