1. Gannan Medical University, Jiangxi, China
2. Department of Neurosurgery, First Affiliated Hospital of Gannan Medical University, Jiangxi, China
3. Department of Neurosurgery, University Hospital of Cologne, Cologne, Germany
4. Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Gannan Medical University, Ganzhou, China