1Department of Clinical Epidemiology, Hyogo College of Medicine, 1-1 Mukogawa, Nishinomiya, Hyogo 663-8501 Japan
2Caress Sapporo Hokko Memorial Clinic N-27, E-8, 1-15, Higashi, Sapporo, Hokkaido 065-0027 Japan
3Department of Pharmacology and Therapeutics, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215 Japan
4Department of Cardiovascular Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849-8501 Japan
5Department of Cardiology, Naha City Hospital, 2-31-1 Furujima, Naha, Okinawa 902-8511 Japan
6Department of Diabetes, Endocrinology and Metabolism, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295 Japan
7Department of Endocrinology and Diabetes Mellitus, Fukuoka University, 7-45-1 Nanakuma, Jyonan, Fukuoka 814-0180 Japan
8Department of Cardiology, Tomishiro Central Hospital, 25 Ueda, Tomigusuku, Okinawa 901-0243 Japan
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