1. Department of Physical Medicine and Rehabilitation; University of Michigan; Ann Arbor Michigan USA
2. Department of Psychological and Brain Sciences; University of Massachusetts; Amherst Massachusetts USA
3. Beth Israel Deaconess Medical Center; Boston Massachusetts USA
4. Institute for Health Services Research & Policy Studies, Feinberg School of Medicine; Northwestern University; Chicago Illinois USA
5. Department of Medical Social Sciences; Northwestern University; Chicago Illinois USA
6. Institute for Social Research; University of Michigan; Ann Arbor Michigan USA
7. Department of Neurology; University of Michigan; Ann Arbor Michigan USA