1. Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan
2. Department of Hepatology, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
3. Department of Hepatobiliary and Pancreatic Surgery, Gunma University Graduate School of Medicine, Maebashi, Japan
4. Clinical Department of Pathology, Gunma University Hospital, Maebashi, Japan
5. Department of Human Pathology, Gunma University Graduate School of Medicine, Maebashi, Japan