1. Research Department of Medical Sciences, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, P.R. China.
2. Department of Biomedical Engineering, School of Medicine, South China University of Technology, Guangzhou, P.R. China.
3. Department of Cardiology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, P.R. China.