1. Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
2. Department of Metabolism and Endocrinology, Kishiwada City Hospital, Kishiwada 596-8501, Japan
3. Radioisotope Research Center, Agency for Health, Safety and Environment, Kyoto University, Kyoto 606-8501, Japan
4. Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
5. Department of Surgery, Kishiwada City Hospital, Kishiwada 596-8501, Japan
6. Department of Pathology, Kishiwada City Hospital, Kishiwada 596-8501, Japan
7. Medical Research Institute Kitano Hospital, PIIF Tazuke-kofukai, Osaka 530-8480, Japan