1. Department of Neurology; P. J. Safarik University; Kosice Slovak Republic
2. Department of Neurology; University Hospital L. Pasteur; Kosice Slovak Republic
3. National Center of Epidemiology and Centro de Investigación Biomedica en Red de Enfermedades Neurodegenerativas (CIBERNED); Carlos III Institute of Health; Madrid Spain
4. Department of Neurology; University of Pécs; Pécs Hungary
5. MTA-PTE Clinical Neuroscience MR Research Group; Pécs Hungary
6. Movement Disorders Unit; Instituto Nacional de Neurologia y Neurocirugia; Mexico Distrito Federal Mexico
7. Département des Maladies du Système Nerveux; Sorbonne Universités; Université Pierre et Marie Curie (UPMC) Paris 06; Institut National de la Santé et de la Recherche Médicale (INSERM) UMRS-1127; CIC-1422; CNRS UMR-7225; Assistance Publique-Hôpitaux de Paris (AP-HP); and Institut du Cerveau et de la Moelle Épinière (ICM); Hôpital Pitié-Salpêtrière; Paris France
8. Department of Neurology and Neurosurgery; University of Tartu; Tartu Estonia
9. Department of Neurology; Medical University of Innsbruck; Innsbruck Austria
10. Department of Neurology; Russian Medical Academy of Postgraduate Education; Moscow Russia
11. Department of Clinical Neuroscience; University College London Institute of Neurology; London UK
12. Sobell Department of Motor Neuroscience; University College London Institute of Neurology; London UK
13. Department of Movement Disorders and Neurodegeneration; Centro Internacional de Restauración Neurológica (CIREN); La Habana Cuba
14. Department of Neurology; Hospital Ramos Mejia; Buenos Aires Argentina
15. Department of Neurology; Donostia Hospital; Biodonostia Institute and Centro de Investigación Biomedica en Red de Enfermedades Neurodegenerativas (CIBERNED); San Sebastian Spain
16. Clinical Neurodegenerative Diseases Research Unit; Instituto Nacional de Neurología y Neurocirugía; Mexico City Mexico
17. Movement Disorders Unit; Institute of Neurosciences; Favaloro University; Institute of Cognitive Neurology; Buenos Aires Argentina
18. Barts Health National Health Service Trust; The Royal London Hospital; London UK
19. Department of Neurology; Comenius University; Martin Slovak Republic
20. Division of Biostatistics; University of Texas School of Public Health at Houston; Houston Texas USA
21. Movement Disorders Program; Department of Neurology; Hospital Ruber Internacional; Madrid Spain
22. Movement Disorders Unit; Department of Neurology; Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS); Madrid Spain
23. Department of Neurology; Complejo Asistencial de Segovia; Segovia Spain
24. Second Department of Neurology; Faculty of Medicine; Comenius University; Bratislava Slovak Republic
25. Department of Neurology; University of Miami; Miami Florida USA
26. Department of Neurology; North Estonian Medical Center; Tallinn Estonia
27. Department of Neurological Sciences; Rush University Medical Center; Chicago Illinois USA