1. Department of Preventive Medicine, Keck School of Medicine; University of Southern California; Los Angeles California
2. Norris Comprehensive Cancer Center; University of Southern California; Los Angeles California
3. Epidemiology Program; University of Hawaii Cancer Center; Honolulu Hawaii
4. Division of Gastroenterology, Department of Medicine; Cedars-Sinai Medical Center; Los Angeles California
5. Department of Epidemiology and University of Pittsburgh Cancer Institute; University of Pittsburgh; Pittsburgh Pennsylvania