1 Department of Neurology, Montreal General Hospital, Montreal, Quebec, Canada. Electronic address: ron.postuma@mcgill.ca.
2 Department of Neurodegeneration, Hertie-Institute for Clinical Brain Research and German Center for Neurodegenerative Diseases, Tuebingen, Germany.
3 The Parkinson's Disease and Movement Disorders Center, Department of Neurology, Mayo Clinic, Scottsdale.
4 Department of Neurology, Radboud university medical center, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, Netherlands.
5 Xuanwu Hospital of Capitol of Medical University, Beijing, Peoples Republic of China.
6 Department of Neurology, Christian-Albrechts University, Kiel, Germany.
7 Rush University Medical Center, Chicago, IL, USA.
8 Neuroscience Research Australia and University of New South Wales, Randwick, Australia.
9 Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada.
10 Division of Neurology, Toronto Western Hospital, Toronto, Ontario, Canada.
11 Department of Neurosciences, UC San Diego, La Jolla, California, USA.
12 Department of Neurodegeneration, Hertie-Institute for Clinical Brain Research and German Center for Neurodegenerative Diseases, Tuebingen, Germany; Institute for Neurodegenerative Disorders, New Haven, CT, USA.
13 Department of Neurology, Philipps University of Marburg, Marburg, Germany.
14 Department of Neurology, The Mount Sinai Hospital, New York, NY, USA.
15 Department of Neurology, Innsbruck Medical University, Innsbruck, Austria.
16 Penn Neurological Institute, Philadelphia, Pennsylvania, USA.