1. Hebei Key Laboratory of Neuropharmacology, Department of Pharmacology, Hebei North University, Zhangjiakou, P. R. China
2. Department of Thoracic-Cardiac Surgery, The First Affiliated Hospital of Hebei North University, Zhangjiakou, P. R. China
3. Department of Vascular Surgery, The First Affiliated Hospital of Hebei North University, Zhangjiakou, P. R. China