1. Department of Neurology, Aarhus University Hospital , 8200 Aarhus N , Denmark
2. Department of Nuclear Medicine and PET, Aarhus University Hospital , 8200 Aarhus N , Denmark
3. Unidad de Trastornos del Movimiento, Servicio de Neurología y Neurofisiología Clínica, Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla , 41013 Seville , Spain
4. Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED), Instituto de Salud Carlos III , 28029 Madrid , Spain
5. Reina Sofia Alzheimer’s Centre, CIEN Foundation-ISCIII , 28031 Madrid , Spain
6. Translational and Clinical Research Institute, Newcastle University , Newcastle upon Tyne NE1 7RU , UK
7. Danish Dementia Research Center, Department of Neurology, Copenhagen University Hospital , 2100 Copenhagen Ø , Denmark
8. Department of Clinical Medicine, University of Copenhagen , 2100 Copenhagen Ø , Denmark
9. Department of Neurology, University of Groningen, University Medical Center Groningen , 9713 GZ Groningen , The Netherlands
10. Department of Neurology, University of Michigan , Ann Arbor, MI 48109 , USA
11. Department of Radiology, University of Michigan , Ann Arbor, MI 48109 , USA
12. Neurology Service and GRECC, VA Ann Arbor Healthcare System , Ann Arbor, MI 48105 , USA
13. Morris K. Udall Center of Excellence for Parkinson’s Disease Research, University of Michigan , Ann Arbor, MI 48109 , USA
14. Parkinson’s Foundation Research Center of Excellence, University of Michigan , Ann Arbor, MI 48109 , USA
15. Department of Clinical Medicine, Aarhus University , 8200 Aarhus N , Denmark