1. Department of Internal Medicine; Tokyo Metropolitan Komagome Hospital; Tokyo Japan
2. Department of Community-Based Medical Education; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
3. Department of Internal Medicine; Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
4. Division of Gastroenterology; Tohoku University Graduate School of Medicine; Sendai Japan
5. Department of Gastroenterology and Hepatology; Kansai Medical University; Hirakata Japan
6. Department of Gastroenterology; Sendai City Medical Center; Sendai Japan