- Correspondence to Dr Li Yang, Department of Neurology, The Second Xiangya Hospital, Central South University, No 139 Middle Renmin Road, Changsha 410011, Hunan, People's Republic of China; Dr Bo Xiao, The first Xiangya Hospital, Central South University, No 87 Xiangya Road, Changsha, 410008, Hunan, People' Republic of China;
- Received August 16, 2015
- Revised October 28, 2015
- Accepted December 2, 2015
- First published January 12, 2016.
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