Lilei Peng1, Jie Fu2, Ligang Chen3. 1. Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, 25# Taiping Street, Jiangyang District, Luzhou, 646000, China. 2. Department of Neurology, The Affiliated Hospital of Southwest Medical University, 25# Taiping Street, Jiangyang District, Luzhou, 646000, China. 3. Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, 25# Taiping Street, Jiangyang District, Luzhou, 646000, China. ttabc246@sina.com.