1. Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, Taipei 112, Taiwan
2. Department of Cardiovascular Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima 960-1295, Japan
3. Department of Medicine, National Yang-Ming University School of Medicine, No.155, Sec.2, Linong Street, Taipei 112, Taiwan
4. Division of Cardiology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, No. 250, Wuxing Street, Xinyi District, Taipei 110, Taiwan