1. College of Medicine University of Nebraska Medical Center Omaha NE USA
2. Division of Gastroenterology Louisiana State University Health Science Center Shreveport LA USA
3. Division of Gastroenterology and Hepatology Department of Internal Medicine University of Nebraska Medical Center Omaha NE USA
4. Department of Family and Preventive Medicine Faculty of Medicine Prince of Songkla University Songkhla Thailand
5. Medical Data Center for Research and Innovation Faculty of Medicine Prince of Songkla University Songkhla Thailand