Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular disease, Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China. Third Cardiology Department, Hippokrateion Hospital, Aristotle University, Medical School, Thessaloniki, Greece. First Department of Cardiology, University of Ioannina Medical School, Ioannina, Greece. Second Department of Cardiology, Laboratory of Cardiac Electrophysiology, "Evangelismos" General Hospital of Athens, Athens, Greece. Lankenau Institute for Medical Research and Lankenau Medical Center, Wynnewood, Pennsylvania,; Beijing Anzhen Hospital, Capital Medical University, Beijing, China. Electronic address: YanG@mlhs.org. Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular disease, Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China. Electronic address: liutongdoc@126.com.