1. Department of Cardiology, Gachon University Gil Medical Center, Incheon, Korea.
2. Department of Cardiology, South Australian Health and Medical Research Institute, University of Adelaide, Adelaide, Australia.
3. Department of Cardiovascular Medinine, Hokko Memorial Clinic, Sapporo, Japan.
4. Department of Epidemiology, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing An Zhen Hospital, Capital Medical University, Beijing, China.