1. Johns Hopkins Disability Health Research Center, Johns Hopkins University, Baltimore, MD, USA
2. The Lurie Institute for Disability Policy, The Heller School for Social Policy and Management, Brandeis University, Waltham, MA, USA
3. ACP Decisions Non-Profit Foundation, Waban, MA, USA
4. Section of General Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
5. Department of Medicine, Tufts Medical Center, Boston, MA, USA
6. Department of Family Medicine, University of Michigan Medical School, Ann Arbor, MI, USA