Erratum to: J Neurol DOI 10.1007/s00415-015-7937-7

The original version of this article unfortunately contained a mistake. First and last names of the authors were interchanged. The correct author names are given below. The original article has been corrected.

Elena Marchesi, Anna Negrotti, Monica Angelini, Matteo Goldoni, Giorgia Abrignani and Stefano Calzetti