1. 1College of Postgraduate, Hebei North University, Zhangjiakou, Hebei, China
2. 2Department of Geriatric Cardiology, Hebei General Hospital, Shijiazhuang, Hebei, China
3. 3Department of Cardiology, Hebei General Hospital, Shijiazhuang, Hebei, China
4. 4Department of Physical Examination Center, Hebei General Hospital, Shijiazhuang, Hebei, China
5. 5Department of Internal Medicine, Hebei General Hospital, Shijiazhuang, China
6. 6Hebei Key Laboratory of Metabolic Disease, Hebei General Hospital, Shijiazhuang, Hebei, China