1. Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Internal Medicine, Severance Hospital, Yonsei University Health System, Seoul, Korea.
4. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
5. Department of Internal Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.
6. Department of Internal Medicine, Chang Gung Memorial Hospital, Linkou, Taiwan.
7. Department of Internal Medicine, Fuwai Hospital, Beijing, China.
8. Department of Internal Medicine, Zhongshan Hospital, Shanghai, China.