1. Medical Care Ward, Beijing Luhe Hospital, Capital Medical University, Beijing 101100, P.R. China
2. Department of Cardiology, QingPu District Central Hospital, Shanghai 201700, P.R. China
3. Department of Outpatients, Shenzhen Traditional Chinese Medicine Hospital, Guangdong Shenzhen Health Management Center, Shenzhen, Guangdong 518033, P.R. China