1. Second Department of Neurology, ‘Attikon’ University Hospital, School of Medicine National and Kapodistrian University of Athens Athens Greece
2. Division of Neurology McMaster University/Population Health Research Institute Hamilton Canada
3. Fourth Department of Internal Medicine, 'Attikon' University Hospital National and Kapodistrian University of Athens Athens Greece
4. Department of Physiotherapy University of West Attica Athens Greece
5. Second Department of Psychiatry, ‘Attikon’ Hospital, School of Medicine National and Kapodistrian University of Athens Athens Greece
6. First Department of Neurology, ‘Eginition’ University Hospital, School of Medicine National and Kapodistrian University of Athens Athens Greece
7. Second Department of Neurology Aristotle University of Thessaloniki Thessaloniki Greece
8. Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine National and Kapodistrian University of Athens Athens Greece
9. Third Department of Critical Care Medicine, Evgenideio Hospital, Medical School National and Kapodistrian University of Athens Athens Greece
10. Department of Neurology, School of Medicine University of Patras Rio‐Patras Greece
11. Hellenic Centre for Disease Control and Prevention Athens Greece
12. Department of Neurology University of Tennessee Health Science Center Memphis Tennessee USA