1. Department of Gastroenterology and Hepatology; National Center for Global Health and Medicine; Tokyo Japan
2. Department of Clinical Research and Informatics; International Clinical Research Center; Research Institute; National Center for Global Health and Medicine; Tokyo Japan
3. Research Center for Hepatitis and Immunology; National Center for Global Health and Medicine; Kohnodai Hospital; Chiba Japan
4. Department of Gastroenterology and Hepatology; National Center for Global Health and Medicine; Kohnodai Hospital; Chiba Japan