1. Department of Radiology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
2. Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
3. Department of Pharmacology, Hebei Medical University, Shijiazhuang, Hebei 050017, P.R. China
4. Department of Pathology, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China