1. Department of Cardiology, Fukuoka University Faculty of Medicine, Fukuoka 814-0180, Japan
2. Department of Cardiology, Fukuoka Heartnet Hospital, Fukuoka 819-0002, Japan
3. Institute of Medical Science, Tokyo Medical University, Shinjuku, Tokyo 160-8402, Japan
4. Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
5. Department of Health Care Center, Imamura Hospital, Saga 841-0061, Japan