1. Department of Neurosurgery, The Second Hospital of Hebei Medical University , Shi Jiazhuang , Hebei 050000 , China
2. Perinatal Center, The Fourth Hospital of Shi Jiazhuang, Shi Jiazhuang , Hebei 050011 , China
3. Department of Neurosurgery, The Second Hospital of Hebei Medical University , No. 215 Heping West Road , Shi Jiazhuang , Hebei 050000 , China