Name	Location	Contribution
James F. Burke	Division of Health Services Research, Department of Neurology, Ohio State University, Columbus	Drafting/revision of the manuscript for content, including medical writing for content; study concept or design
Kevin A. Kerber, MD	Division of Health Services Research, Department of Neurology, Ohio State University, Columbus	Drafting/revision of the manuscript for content, including medical writing for content
Kenneth M. Langa	Department of Internal Medicine, University of Michigan, Ann Arbor	Drafting/revision of the manuscript for content, including medical writing for content
Roger L. Albin	Department of Neurology, University of Michigan, Ann Arbor	Drafting/revision of the manuscript for content, including medical writing for content
Vikas Kotagal, MD	Department of Neurology, University of Michigan, Ann Arbor	Drafting/revision of the manuscript for content, including medical writing for content