The authors regret to have forgotten one acknowledgment, which now reads as follows: This work was supported by the ELSAT 2020 project, the European Union with the European Regional Development Fund, The French State, the Regional Council of Hauts-de-France and the Ligue Française contre la Sclérose en Plaques (LFSEP): the authors gratefully acknowledge the support of these institutions and association. The authors would like to apologize for any inconvenience.