1. Movement Disorders Unit, Department of Neurology Hospital Clínico Universitario de Santiago Santiago de Compostela Spain
2. Movement Disorders Unit, Department of Neurology Hospital Ramón y Cajal Madrid Spain
3. Department of Neurophysiology Hospital Clínico Universitario de Santiago Santiago de Compostela Spain
4. Department of Otorhinolaryngology Hospital Clínico Universitario de Santiago Santiago de Compostela Spain