1. Headache Unit Department of Neurology Hospital Clínico San Carlos Madrid Spain
2. Department of Physical Therapy Occupational Therapy, Rehabilitation and Physical Medicine Universidad Rey Juan Carlos Alcorcón Madrid Spain
3. Headache Unit Department of Neurology Hospital Clínico Universitario de Valladolid Valladolid Spain
4. Institute for Biomedical Research of Salamanca (IBSAL) Salamanca Spain
5. Department of Medicine School of Medicine Universidad Complutense de Madrid Madrid Spain