Affiliation: | 1. Department of Medicine, Division of Gastroenterology and Hepatology, Penn State University Milton S. Hershey Medical Center, Hershey, Pennsylvania;2. Department of Internal Medicine, Division of Gastroenterology and Hepatology, Penn State University Milton S. Hershey Medical Center, Hershey, Pennsylvania;3. Department of Public Health Sciences, Penn State College of Medicine, Penn State Hershey Medical Center, Hershey, Pennsylvania |