About the Authors

Georgios Tsivgoulis

tsivgoulisgiorg@yahoo.gr

Affiliations Second Department of Neurology, “Attikon” Hospital, School of Medicine, University of Athens, Athens, Greece, Department of Neurology, The University of Tennessee Health Science Center, Memphis, Tennessee, United States of America, International Clinical Research Center, Department of Neurology, St. Anne’s University Hospital in Brno, Brno, Czech Republic

Aristeidis H. Katsanos

Affiliations Second Department of Neurology, “Attikon” Hospital, School of Medicine, University of Athens, Athens, Greece, Department of Neurology, School of Medicine, University of Ioannina, Ioannina, Greece

Nikolaos Grigoriadis

Affiliation Second Department of Neurology, “AHEPA” University Hospital, Aristotelion University of Thessaloniki, Thessaloniki, Macedonia, Greece

Georgios M. Hadjigeorgiou

Affiliation Department of Neurology, University Hospital of Larissa, University of Thessaly, Larissa, Greece

Ioannis Heliopoulos

Affiliation Department of Neurology, Alexandroupolis University Hospital, Democritus University of Thrace, Alexandroupolis, Greece

Constantinos Kilidireas

Affiliation First Department of Neurology, “Eginition” Hospital, School of Medicine, University of Athens, Athens, Greece

Konstantinos Voumvourakis

Affiliation Second Department of Neurology, “Attikon” Hospital, School of Medicine, University of Athens, Athens, Greece

Competing Interests

The authors received funding from commercial sources: Teva Pharmaceutical Hellas, Novartis Hellas, Biogen Idec, Merck Serono and Genesis Pharma. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: GT KV. Analyzed the data: GT AHK. Contributed reagents/materials/analysis tools: NG GMH. Wrote the paper: GT AHK. Critical revisions: NG GMH IH CK.