University of Pennsylvania - Department of Neurology, Amprion Inc. - R & D Unit, University of Iowa - Department of Biostatistics, Amprion Inc. - R & D Unit, Amprion Inc. - R & D Unit, Amprion Inc. - R & D Unit, Amprion Inc. - R & D Unit, Tel Aviv Sourasky Medical Centre - Department of Neurology, University of Pittsburgh - Department of Neurology, Indiana University School of Medicine, University of California, San Diego (UCSD) - Department of Neurology, University of Rochester - School of Medicine and Dentistry, Vincere Biosciences Inc, University of Göttingen - Department of Neurology, Stanford University - Department of Neurology and Neurological Sciences, Institute for Neurodegenerative Disorders, Northwestern University (Philippines) - Department of Neurology, University of California, San Francisco (UCSF) - Department of Neurology, University of Pennsylvania - Department of Psychiatry, Harvard University - Neurological Clinical Research Institute, University of Iowa - Department of Biostatistics, University of Iowa - Department of Biostatistics, University of Iowa - Department of Biostatistics, University of Iowa - Department of Biostatistics, The Michael J. Fox Foundation, The Michael J. Fox Foundation, The Michael J. Fox Foundation, Institute for Neurodegenerative Disorders, University of Texas at Houston, McGovern Medical School, Department of Neurology and Independent