1. Department of General Internal Medicine; Kyushu University Hospital; Fukuoka Japan
2. Department of Environmental Medicine and Infectious Disease; Kyushu University; Fukuoka Japan
3. Department of Hepatology; Steel Memorial Yawata Hospital; Kitakyushu Japan
4. Department of Medicine; Hamanomachi Hospital; Fukuoka Japan
5. Center for Liver Disease; National Hospital Organization Kokura Medical Center; Kitakyushu Japan