1. Department of Gastroenterology and Hepatology; National Center for Global Health and Medicine; 1-21-1 Toyama Shinjuku-ku Tokyo 162-8655 Japan
2. Department of Diagnostic Radiology; National Center for Global Health and Medicine; 1-21-1 Toyama Shinjuku-ku Tokyo 162-8655 Japan
3. Department of Clinical Research and Informatics; International Clinical Research Center Research Institute, National Center for Global Health and Medicine; 1-21-1 Toyama Shinjuku-ku Tokyo 162-8655 Japan
4. Department of Diabetes Research; Diabetes Research Center, National Center for Global Health and Medicine; 1-21-1 Toyama Shinjuku-ku Tokyo 162-8655 Japan
5. Clinical Research Center for Clinical Sciences, National Center for Global Health and Medicine; 1-21-1 Toyama Shinjuku-ku Tokyo 162-8655 Japan
6. Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine, Kohnodai Hospital; 1-7-1 Kohnodai Ichikawa Chiba 272-8516 Japan
7. Department of Gastroenterology and Hepatology; National Center for Global Health and Medicine, Kohnodai Hospital; 1-7-1 Kohnodai Ichikawa Chiba 272-8516 Japan