title: Study questions interval for screening sigmoidoscopy.
authors.forename: Deborah
authors.initials: D
authors.lastname: Levenson
mesh_terms: D000328:Adult; D000368:Aged; D000570:American Cancer Society; D003113:Colonoscopy / Q000706:statistics & numerical data*; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans; D015994:Incidence; D008403:Mass Screening / Q000706:statistics & numerical data*; D008875:Middle Aged; D017410:Practice Guidelines as Topic; D012812:Sigmoidoscopy / Q000706:statistics & numerical data*; D013997:Time Factors; D014481:United States; D019564:Unnecessary Procedures