CHEN Guang-zhong1,LI Tie-lin1,QUAN Wei2,HUANG Tao1,ZHAO Qing-ping3,WANG Jian-qi1,DUAN Chuan-zhi1,WANG Qiu-jing1,JIANG Xiao-dan1 1Department of Neurosurgery,Zhujiang Hospital,Southern Medical University,Guangzhou 510282,China;2Department of Neurosurgery,First Municipal People’s Hospital of Guangzhou,Guangzhou 51000,China;3Department of Neurosurgery,Yuhuangding Hospital of Yantai,Yantai 265000,China