1. Department of Surgery, Shiga University of Medical Science, Otsu, Shiga 520‐2192
2. Division of Diabetes, Digestive and Kidney Diseases, Department of Clinical Molecular Medicine, Kobe University Graduate School of Medicine, Kobe 650‐0017, Japan
3. Department of Anatomy, Shiga University of Medical Science, Otsu, Shiga 520‐2192