1. Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, P. R. China
2. Department of Cardiology, Zhejiang Provincial People’s Hospital, Hangzhou, P. R. China
3. Department of Cardiology, Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, P. R. China
4. Department of Cardiology, Anqing First People’s Hospital of Anhui Province, Anqing, P. R. China