1. SysDiag CNRS / Bio-Rad UMR3145, 1682 rue de la Valsiere, Montpellier, France
2. Neurology Service, Gui de Chauliac Hospital, 80 Avenue Augustin Fliche, Montpellier, France
3. Univ. Montpellier 2, Montpellier, F-34095 France; Inserm, U710, Montpellier, F-34095 France; EPHE, Paris, F-75007 France