Erratum to: J Neurol DOI 10.1007/s00415-013-7086-9

The original version of this article unfortunately contained a mistake. The affiliation of the authors Chao Gao, Xiao-Guang Luo, Yan Ren and Zhi-Yi He is incorrect. The correct affiliation should be:

Neurology Department of First Affiliated Hospital of China Medical University, Shenyang, People’s Republic of China.