Department of Medicine, Baoding Hengtian Hospital, Hebei Baoding 071000 China;
Department of Cardiology, Affiliated Hospital of Hebei University, Baoding 071000 China;
Department of Cardiology, Affiliated Hospital of Hebei University, Baoding 071000 China;
Department of Cardiology, Affiliated Hospital of Hebei University, Baoding 071000 China;
Department of Cardiology, Affiliated Hospital of Hebei University, Baoding 071000 China;