1. First Department of Internal Medicine, Nara Medical University, Kashihara, Nara, Japan
2. Center for Medical Education, Kyoto University Graduate School of Medicine, Kyoto, Japan
3. Department of Cardiovascular Medicine, Graduate Medical School of Medical Science, Kumamoto University, Kumamoto, Japan
4. Jinnouch Hospital, Kumamoto, Japan
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Shizuoka City Hospital, Shizuoka, Japan