Name	Location	Contribution
Julia Gallagher, BS	Department of Neurology, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content; major role in the acquisition of data; study concept or design; analysis or interpretation of data
Caroline Gochanour, MS	Department of Biostatistics, University of Iowa, Iowa City	Drafting/revision of the manuscript for content, including medical writing for content; analysis or interpretation of data
Chelsea Caspell-Garcia, MS	Department of Biostatistics, University of Iowa, Iowa City	Drafting/revision of the manuscript for content, including medical writing for content; analysis or interpretation of data
Roseanne D. Dobkin, PhD	Department of Psychiatry, Rutgers University, Newark, NJ	Drafting/revision of the manuscript for content, including medical writing for content
Dag Aarsland, MD, PhD	Department of Old Age Psychiatry, Kings College London, UK	Drafting/revision of the manuscript for content, including medical writing for content
Roy N. Alcalay, MD	Neurological Institute, Tel Aviv Sourasky Medical Center, Israel; Department of Neurology, Columbia University Irving Medical Center, New York, NY	Drafting/revision of the manuscript for content, including medical writing for content
Matthew J. Barrett, MD, MSc	Department of Neurology, Virginia Commonwealth University, Richmond	Drafting/revision of the manuscript for content, including medical writing for content
Lana Chahine, MD, MS	Department of Neurology, University of Pittsburgh, PA	Drafting/revision of the manuscript for content, including medical writing for content
Alice S. Chen-Plotkin, MD, MSc	Department of Neurology, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content
Christopher S. Coffey, PhD	Department of Biostatistics, University of Iowa, Iowa City	Drafting/revision of the manuscript for content, including medical writing for content
Nabila Dahodwala, MD, MS	Department of Neurology, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content
Jamie L. Eberling, PhD	The Michael J. Fox Foundation for Parkinson's Research, New York, NY	Drafting/revision of the manuscript for content, including medical writing for content
Alberto J. Espay, MD	James J. and Joan A. Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, OH	Drafting/revision of the manuscript for content, including medical writing for content
James B. Leverenz, MD	Cleveland Clinic, Neurological Institute, Lou Ruvo Center for Brain Health, OH	Drafting/revision of the manuscript for content, including medical writing for content
Irene Litvan, MD	Department of Neuroscience, University of California San Diego	Drafting/revision of the manuscript for content, including medical writing for content
Eugenia Mamikonyan, MS	Department of Psychiatry, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content; major role in the acquisition of data; study concept or design; analysis or interpretation of data
James Morley, MD, PhD	Department of Neurology, University of Pennsylvania; Parkinson's Disease Research, Education and Clinical Center (PADRECC), Crescenz Veteran's Affairs Medical Center, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content
Irene H. Richard, MD	Department of Neurology, University of Rochester, NY	Drafting/revision of the manuscript for content, including medical writing for content
Liana Rosenthal, MD, PhD	Department of Neurology, Johns Hopkins University, Baltimore, MD	Drafting/revision of the manuscript for content, including medical writing for content
Andrew D. Siderowf, MD, MSCE	Department of Neurology, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content
Tatyana Simuni, MD	Department of Neurology, Northwestern University, Chicago, IL	Drafting/revision of the manuscript for content, including medical writing for content
Michele K. York, PhD	Departments of Neurology and Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX	Drafting/revision of the manuscript for content, including medical writing for content
Allison W. Willis, MD, MSCI	Department of Neurology, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content
Sharon X. Xie, PhD	Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia	Drafting/revision of the manuscript for content, including medical writing for content
Daniel Weintraub, MD	Department of Neurology, and Department of Psychiatry, University of Pennsylvania; Parkinson's Disease Research, Education and Clinical Center (PADRECC), Crescenz Veteran's Affairs Medical Center, Philadelphia, PA	Drafting/revision of the manuscript for content, including medical writing for content; major role in the acquisition of data; study concept or design; analysis or interpretation of data