1. 5th Department of Cardiology, Hebei General Hospital, Shijiazhuang 050051, P.R. China
2. Science and Education Office, Hebei General Hospital, Shijiazhuang 050051, Hebei Province, P.R. China
3. North China University of Science and Technology, Tangshan 063200, Hebei Province, P.R. China
4. Department of Emergency, Hebei General Hospital, Shijiazhuang 050051, Hebei Province, P.R. China
5. Department of Internal Medicine Nursing, Hebei College of Traditional Chinese Medicine, Shijiazhuang 050051, Hebei Province, P.R. China
6. 4th Department of Cardiology, Hebei General Hospital, Shijiazhuang 050051, Hebei Province, P.R. China
7. Department of Endocrinology, Hebei General Hospital, Shijiazhuang 050051, Hebei Province, P.R. China
8. 6th Department of Cardiology, Hebei General Hospital, Shijiazhuang 050051, Hebei Province, P.R. China