1Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA;

2White River Junction VAMC, White River Junction, Vermont, USA;

3New Hampshire Colonoscopy Registry, Lebanon, New Hampshire, USA;

4University of Connecticut, Storrs, Connecticut, USA;

5Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA;

6Department of Gastroenterology and Hepatology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA.

Correspondence: Joseph C. Anderson, MD. E-mail: [email protected].