1. Division of Endocrinology and Metabolism, Department of Homeostatic Regulation, National Institute for Physiological Sciences National Institute of Natural Sciences 38 Nishigonaka, Myodaiji Okazaki Aichi 444‐8585 Japan
2. School of Life Science The Graduate University for Advanced Studies SOKENDAI 38 Nishigonaka, Myodaiji Okazaki Aichi 444‐8585 Japan
3. Second Department of Internal Medicine (Endocrinology Diabetes and Metabolism, Hematology, Rheumatology), Graduate School of Medicine University of the Ryukyus 207 Uehara, Nishihara, Nakagami‐gun Okinawa 903‐0215 Japan