1. Headache Unit; Hospital Clínico Universitario de Valladolid; Valladolid Spain
2. Department of Physical Therapy; Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos; Alcorcón Spain
3. Physical Activity and Human Performance group, SMI, Department of Health Science and Technology; Aalborg University; Aalborg Denmark
4. Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, School of Medicine; Aalborg University; Aalborg Denmark