1. Department of Pathology, University of Utah School of Medicine and ARUP Laboratories, Salt Lake City, UT
2. Department of Mathematics, University of Utah, Salt Lake City, UT
3. Department of Health Economics, Sydney School of Public Health, University of Sydney, Sydney, Australia
4. Department of Surgical Pathology, University of Utah School of Medicine and ARUP Laboratories, Salt Lake City, UT
5. Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX
6. Gastroenterology Division, University of Utah School of Medicine, Salt Lake City, UT