1. Department of Cardiology, Urasoe General Hospital, Urasoe 901-2132, Japan
2. Department of Internal Medicine, Naha City Hospital, Naha 902-8511, Japan
3. Division of Genomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
4. Division of Community Medicine and Career Development, Kobe University Graduate School of Medicine, Kobe 652-0032, Japan