1. Medical School of Chinese PLA, Beijing 100853, P.R. China
2. Department of Cardiology, The Second Medical Center, Chinese PLA General Hospital, Beijing 100853, P.R. China
3. Department of Functional Examination, Penglai Traditional Chinese Medicine Hospital, Penglai, Shandong 265600, P.R. China
4. Department of Pathophysiology, Chinese PLA General Hospital, Beijing 100853, P.R. China