1. Department of Neurology, University of Michigan Medical School, Ann Arbor, MI, USA
2. Department of Health Behavior and Health Education, University of Michigan School of Public Health, Ann Arbor, MI, USA
3. Department of Physical Medicine & Rehabilitation, University of Michigan Medical School, Ann Arbor, MI, USA
4. Institute for Social Research, University of Michigan, Ann Arbor, MI, USA
5. Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA
6. Department of Life Sciences, Texas A&M University, Corpus Christi, TX, USA
7. Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, MI, USA
8. Center for Social Epidemiology and Population Health, University of Michigan School of Public Health, Ann Arbor, MI, USA