1. Functional Neurosurgery Unit, Hospital Universitario Ramón y Cajal, Madrid, Spain
2. Department of Internal Medicine, Neurology Section, Hospital Arquitecto Marcide, Complejo Hospitalario Universitario de Ferrol (CHUF), A Coruña, Spain
3. Department of Neurology, Movement Disorders Unit, Hospital Clínico San Carlos, Madrid, Spain
4. Department of Neurology, Movement Disorders Unit, Parc de salut Mar, Institut Hospital del Mar d’investigacions Mèdicas, Universitat Autònoma de Barcelona, Barcelona, Spain
5. Department of Neurology, Movement Disorders Unit, Hospital Clínic, Barcelona, Spain
6. Department of Neurology, Hospital General Universitario Gregorio Marañón, Madrid, Spain
7. Department of Neurology, Movement Disorders Unit, Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Seville, Spain
8. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
9. AbbVie Spain S.L.U., Madrid, Spain
10. Department of Neurology, Hospital Universitario Insular de Gran Canaria, Las Palmas de Gran Canaria, Spain