1. Penn State Hershey Medical Center, Penn State College of Medicine, Division of General Internal Medicine, 500 University Drive, Hershey, PA 17033, USA
2. Memorial Hermann Sugar Land Hospital, 17500 West Grand Parkway, Sugar Land, TX 77479, USA
3. Penn State Hershey Medical Center, Penn State College of Medicine, Division of Gastroenterology and Hepatology, 500 University Drive, Hershey, PA 17033, USA