1. Department of Cardiology, Serres General Hospital, Serres, Greece;
2. Department of Cardiology, Papanikolaou General Hospital, Thessaloniki, Greece;
3. Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular disease, Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin, PR China