1. Indiana University School of Medicine, Indianapolis, Indiana (D.K.R., I.B., M.F., A.G., T.J., S.K., T.N., I.O., N.R., S.S., A.S., R.S.)
2. University of Kansas Medical Center, Kansas City, Kansas (D.B., S.H., M.J., S.K., J.L., E.M., M.P., S.S., A.R.)
3. University of Colorado Boulder, Boulder, Colorado (J.B., B.F., M.G., J.K., M.K., P.M., J.N., S.P., F.S., S.S., A.W.)
4. University of Alabama at Birmingham, Birmingham, Alabama (A.C., A.E., K.R.K.K.B., S.P., F.S.)
5. Borland Groover, Jacksonville, Florida (K.C., J.H., M.I., D.K., B.M., J.C.M., B.M.R., J.R.)
6. San Francisco VA Medical Center, San Francisco, California (T.K., C.K., J.R.)
7. Department of Statistics, Olympus America Corporation, Center Valley, Pennsylvania (J.Z.)
8. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy, and Endoscopy Unit and Humanitas Clinical and Research Hospital, IRCCS, Rozzano, Italy (A.R., C.H.)
9. Division of Gastroenterology, Vancouver General Hospital; University of British Columbia; and Satisfai Health, Vancouver, British Columbia, Canada (M.F.B.).