1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Arizona College of Medicine—Phoenix, Phoenix, Arizona, USA;
2. Banner—University Medical Center Phoenix, Phoenix, Arizona, USA;
3. Academy of Science and Medicine, Crescenta Valley High School, Los Angeles, California, USA;
4. Division of Gastroenterology and Hepatology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA;
5. Division of Gastroenterology, Department of Medicine, Olive View-UCLA Medical Center, Sylmar, California, USA;
6. David Geffen School of Medicine at UCLA, Los Angeles, California, USA.