| Affiliation: | 1. Department of Neurology, Hospital Universitario Fundación Alcorcón, Alcorcón, Madrid, Spain;2. Department of Neurology, Hospital Universitario Quironsalud Madrid, Pozuelo de Alarcón, Madrid, Spain;3. Headache Unit, Department of Neurology, Hospital Clínico San Carlos, Madrid, Spain;4. Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain;5. Pain Clinic, Department of Anesthesiology, Hospital Universitario Fundación Alcorcón, Alcorcón, Madrid, Spain;6. Department of Ophthalmology, Hospital Universitario Fundación Alcorcón, Alcorcón, Madrid, Spain |
