1. Department of Dermatology Yokohama City University School of Medicine Yokohama Japan
2. Department of Gastroenterological Surgery Yokohama City University School of Medicine Yokohama Japan
3. Department of Gastroenterology and Hepatology Yokohama City University School of Medicine Yokohama Japan
4. International Clinical Center for Liver Diseases Yokohama City University Yokohama Japan
5. Department of Pathology Yokohama City University School of Medicine Yokohama Japan