1. The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
2. McGaw Bioethics Scholars Program, Center for Bioethics and Humanities, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
3. Division of Palliative Medicine, Department of Medicine, University of California, San Francisco, San Francisco, California, USA.
4. Michigan Institute for Clinical and Health Research, University of Michigan, Ann Arbor, Michigan, USA.
5. Department of Neurology, University of Wisconsin-Madison, Madison, Wisconsin, USA.
6. Department of Neurology and Medicine, University of Rochester Medical Center, Rochester, New York, USA.
7. Department of Psychiatry and Behavioral Sciences, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
8. Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.
9. Struthers Parkinson's Center, Golden Valley, Minnesota, USA.
10. Department of Psychiatry, Georgetown University, Washington, DC, USA.
11. Department of Neurology, Washington University in St. Louis, St. Louis, Missouri, USA.
12. Department of Psychiatry, University of California, San Diego, California, USA.
13. Cognitive Neuroscience Laboratory, Think + Speak Lab, Shirley Ryan Ability Lab, Chicago, Illinois, USA.
14. Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
15. Department of Physical Medicine and Rehabilitation, University of Michigan, Ann Arbor, Michigan, USA.