1. Graduate School, Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
2. The First Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
3. College of Integrated Traditional Chinese and Western Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China