1. Division of Gastroenterology; University of Arizona; Tucson Arizona
2. Division of Gastroenterology; Baystate Medical Center; Springfield Massachusetts
3. Center for Quality of Care Research; Baystate Medical Center; Springfield Massachusetts
4. Division of General Medicine; Baystate Medical Center; Springfield Massachusetts
5. Department of Medicine; Tufts University School of Medicine; Boston Massachusetts
6. Epidemiology & Biostatistics Research Core; Baystate Medical Center; Springfield Massachusetts