1. Department of Cardiovascular Medicine, Liuzhou Traditional Chinese Medical Hospital, Liuzhou, Guangxi Zhuang Autonomous Region 545001, P.R. China
2. Department of Cardiovascular Medicine, Guangxi University of Chinese Medicine, Nanning, Guangxi Zhuang Autonomous Region 530000, P.R. China
3. Department of Cardiovascular Medicine, Guangzhou University of Chinese Medicine First Affiliated Hospital, Guangzhou, Guangdong 510405, P.R. China