1. Department of Neurosurgery, The Translational Research Institute for Neurological Disorders, The First Affiliated Hospital (Yijishan Hospital), Wannan Medical College, Wuhu, P. R. China
2. Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Anhui Medical University, Hefei, China
3. Department of Orthopaedics, The Second Affiliated Hospital of Anhui Medical University, Hefei, China