1. The Third Department of Cardiovascular Medicine, Handan Central Hospital, Handan, Hebei 056002, P.R. China
2. The First Department of Cardiovascular Medicine, Affiliated Hospital of Hebei University of Technology, Handan, Hebei 056002, P.R. China
3. The First Department of Cardiovascular Medicine, Handan Central Hospital, Handan, Hebei 056001, P.R. China