1. Department of Neurosurgery, The National Key Clinic Specialty, Hainan General Hospital, Hainan Clinical Medicine Research Institution, Haikou, Hainan 570311, P.R. China
2. Department of Neurosurgery, The National Key Clinic Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China