**Author details**

Tong Liu1\*, Panagiotis Korantzopoulos2 and Guangping Li1

\*Address all correspondence to: liutongdoc@yahoo.com.cn

1 Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China

2 Department of Cardiology, University of Ioannina Medical School, Ioannina, Greece

Conflict of interest: None declared
