1. Division of Gastroenterology, Department of Medicine; New York University School of Medicine; New York New York
2. VA New York Harbor Healthcare System; New York New York
3. Departments of Epidemiology and Medical Geography; University of Washington; Seattle Washington
4. Departments of Statistics and Biostatistics; University of Washington; Seattle Washington
5. Division of Gastroenterology, Department of Medicine; University of Washington; Seattle Washington