1. Department of Neurosurgery, CPLA Bethune International Peace Hospital, Shijiazhuang, Hebei, P.R. China
2. College of Basic Medicine, Hebei Medical University, Shijiazhuang, Hebei, P.R. China
3. Department of Chest Surgery, The Chest Hospital of Hebei Province, Shijiazhuang, Hebei, P.R. China
4. Hospital of China Railway Electric Bureau Group, First Engineering Company, Shijiazhuang, Hebei, P.R. China
5. Department of Neurology, The Chest Hospital of Hebei Province, Shijiazhuang, Hebei, P.R. China