1. Third Department of Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Japan
2. Division of Nephrology and Metabolism, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
3. Division of Endocrinology and Metabolism, Department of Internal Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
4. Third Department of Internal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
5. Department of Internal Medicine, Kitasato University School of Medicine, Sagamihara, Japan