1. Second Department of Neurology School of Medicine “Attikon” University HospitalNational and Kapodistrian University of Athens Athens Greece
2. First Department of Neurology School of Medicine “Eginition” University HospitalNational and Kapodistrian University of Athens Athens Greece
3. Headache Clinic Mediterraneo Hospital Glyfada Greece
4. Iatropolis Magnetic Resonance Diagnostic Centre Athens Greece
5. Second Department of Radiology School of Medicine “Attikon” University HospitalNational and Kapodistrian University of Athens Athens Greece
6. Second Department of Neurology School of Medicine "AHEPA" University Hospital of ThessalonikiAristotle University of Thessaloniki Thessaloniki Greece
7. Department of Neurology School of Medicine, School of Health Sciences University Hospital of LarissaUniversity of Thessaly Larissa Greece
8. Department of Neurology University of Tennessee Health Science Center Memphis Tennessee USA