*Hospital of Weifang Medical University, School of Clinical Medicine, Weifang Medical University

†Department of Neurosurgery, Weifang People’s Hospital Affiliated to Weifang Medical University, Weifang, China

Address correspondence and reprint requests to Zengwu Wang, MD, Department of Neurosurgery,Weifang People's Hospital Affiliated to Weifang Medical University, Weifang 261000, China. E-mail: [email protected]

The authors report no conflicts of interest.