1. Department of Diabetes and Endocrinology, Sapporo City General Hospital, 060-8604 Sapporo, Japan
2. Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, 060-8648 Sapporo, Japan
3. Department of Radiation Technology, Sapporo City General Hospital, 060-8604 Sapporo, Japan
4. Department of Diagnostic Radiology, Sapporo City General Hospital, 060-8604 Sapporo, Japan