1. Department of Preventive Medicine, Keck School of Medicine of University of Southern California, Los Angeles, CA
2. Norris Comprehensive Cancer Center, Keck School of Medicine of University of Southern California, Los Angeles, CA
3. Department of Internal Medicine, Mayo Clinic College of Medicine, Rochester, MN
4. Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI
5. Division of Gastroenterology, Departments of Medicine, Cedars-Sinai Medical Center and Department of Veterans Affairs, Los Angeles, CA