1. Department of Cardiology, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, P.R. China
2. Department of Cardiology, Beijing Fengtai District Hospital of Chinese Medicine, Beijing, P.R. China
3. Department of Cardiology, Dongfang Hospital Beijing University of Chinese Medicine, Beijing, P.R. China
4. Department of Cardiology, Beijing University of Chinese Medicine Third Affiliated Hospital, Beijing, P.R. China