1. Division of Cardiology, Yuan's General Hospital, Kaohsiung City, Taiwan
2. Department of Medicine, Gou-Zen Hospital, Pingtong City, Taiwan
3. An-Fa Institution of Preventive Medicine, Taipei, Taiwan
4. Institute of Occupation and Environment Health Science, National Yang-Ming University, Taipei, Taiwan
5. Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota