1 Department of Public Health, Tzu-Chi University, Hualien, Taiwan; Department of Medicine, Hualien Armed Forces General Hospital, Hualien, Taiwan. Electronic address: farmer507@yahoo.com.tw.
2 Department of Public Health, Tzu-Chi University, Hualien, Taiwan.
3 Division of Cardiology, Buddhist Tzu-Chi General Hospital, Hualien, Taiwan.
4 Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.