1. Department of Cardiology, Beijing Chao-Yang Hospital, Capital Medical University, China
2. Department of Epidemiology and Biostatistics, School of Public Health, Capital Medical University, China
3. Center of Clinical Epidemiology and Evidence-based Medicine, Beijing Children’s Hospital, Capital Medical University, China
4. Center for Molecular Medicine and Experimental Therapeutics, University of Houston, USA
5. Fu-Wai Hospital, Chinese Academy of Medical Sciences, China
6. Department of Respiratory Medicine, China-Japan Friendship Hospital, Capital Medical University, Beijing, China