Division of Gastroenterology, University of Michigan Health System;
Division of Gastroenterology, Ann Arbor Veterans’ Administration Hospital;
Center for Statistical Consultation and Research, University of Michigan;
Department of Biostatistics, University of Michigan;
Division of Gastroenterology, John D.Dingell VA Medical Center;
Colorectal; cancer; screening; Bowel; preparation; Colonoscopy; Average-risk;