aDepartment of Neurosurgery, The First Affiliated Hospital of Kunming Medical University, Kunming 650000, China bCancer Center, Yantai Affiliated Hospital of Binzhou Medical University, The 2nd Medical College of Binzhou Medical University, Yantai 264100, China Lin-Jie Mu, Ting-Ting Wang These authors contributed equally to this work. Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Published online ■ ■ ⁎Corresponding author. Address: Cancer Center, Yantai Affiliated Hospital of Binzhou Medical University, The 2nd Medical College of Binzhou Medical University, Yantai 264100, China. E-mail: [email protected] (Y. D. Miao). This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/