1. Department of Endocrinology and Diabetic Medicine, Hiroshima University Hospital, Hiroshima 734-8551, Japan
2. Department of Endocrinology and Diabetology, Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima 731-0293, Japan
3. Department of Surgery, Kure Kyosai Hospital, Hiroshima 737-8505, Japan
4. Department of Surgery, Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima 731-0293, Japan
5. Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
6. Department of Endocrinology and Metabolism, Hiroshima Red Cross Hospital and Atomic Bomb Survivors Hospital, Hiroshima 730-8619, Japan