1. Division of Gastroenterology; Baystate Medical Center; Tufts University School of Medicine; Springfield MA USA
2. Epidemiology/Biostatistics Research Core; Baystate Medical Center; Tufts University School of Medicine; Springfield MA USA
3. Center for Quality of Care Research; Baystate Medical Center; Tufts University School of Medicine; Springfield MA USA
4. Division of General Internal Medicine; Baystate Medical Center; Springfield MA USA
5. Department of Medicine; Tufts University School of Medicine; Boston MA USA