1. Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos, Madrid, Spain
2. Headache Unit, Department of Neurology, Hospital Clínico Universitario de Valladolid, Valladolid, Spain
3. Department of Medicine, Universidad de Valladolid, Valladolid, Spain
4. Intelligent Data Analysis Laboratory, Department of Electronic Engineering, ETSE (Engineering School), Universitat de València, Valencia, Spain
5. Gerencia de Atención Primaria Valladolid Este, Valladolid, Spain
6. Department of Public Health, Universidad Rey Juan Carlos, Madrid, Spain