1. Department of Medicine, Liver Center, Division of Gastroenterology, Massachusetts General Hospital, Boston Massachusetts, USA
2. George Washington University School of Medicine, Washington D.C., 2001
3. Harvard Medical School, Boston Massachusetts, USA
4. Department of Medicine, Massachusetts General Hospital, Boston Massachusetts, USA
5. University of California San Francisco Medical Center, San Francisco, California, USA
6. Central Michigan University College of Medicine, Mt Pleasant, Michigan
7. Clinical and Translational Epidemiology Unit (CTEU), Massachusetts General Hospital, Boston Massachusetts, USA