Ren-Shi Xu, Department of Neurology, the First Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
Author contributions: Xu RS performed the literature review, integrated key scientific concepts and wrote the paper.
Supported by National Nature Science foundation of China (NSFC), No. 30560042, No. 81160161 and No. 81360198; by the Education Department of Jiangxi province (EDJX), No. GJJ10303.
Conflict-of-interest: The author declares that he has no competing interests.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Ren-Shi Xu, MD, PhD, Department of Neurology, the First Affiliated Hospital of Nanchang University, No. 17 of Yongwaizheng St., Nanchang 330006, Jiangxi Province, China. email@example.com
Received: June 30, 2014
Peer-review started: July 2, 2014
First decision: September 18, 2014
Revised: November 20, 2014
Accepted: December 3, 2014
Article in press: December 10, 2014
Published online: February 15, 2015