1. First Department of Medicine, Wakayama Medical University, Wakayama, Japan
2. Department of Thoracic and Cardiovascular Surgery, Wakayama Medical University, Wakayama, Japan
3. Department of Endocrinology and Diabetes, Kobe City Medical Center General Hospital, Chuo-ku, Kobe, Japan
4. Department of Endocrinology, Tenri Hospital, Tenri, Nara, Japan