1. Department of Medicine, Division of Gastroenterology and Hepatology, Shinshu University School of Medicine, Matsumoto, Japan
2. Department of Respiratory Medicine, Shinonoi General Hospital, Nagano, Japan
3. Research Center for Next Generation Medicine, Shinshu University, Matsumoto, Japan
4. Department of Diagnostic Pathology, Shinonoi General Hospital, Nagano, Japan