1. Veterans Affairs Health Services Research and Development Center for Care Delivery and Outcomes Research Minneapolis Veterans Affairs Health Care System Minneapolis Minnesota USA
2. Department of Medicine University of Minnesota Minneapolis Minnesota USA
3. Department of Physical Therapy University of Arkansas for Medical Sciences Fayetteville Arkansas USA
4. Department of Physical Therapy and Rehabilitation Science University of California San Francisco California USA
5. Department of Physical Therapy and Rehabilitation Science University of Maryland School of Medicine Baltimore Maryland USA
6. Department of Epidemiology and Public Health University of Maryland School of Medicine Baltimore Maryland USA
7. Division of Geriatric and Palliative Medicine, McGovern Medical School The University of Texas Health Science Center at Houston Houston Texas USA
8. Division of Health Policy and Management University of Minnesota Minneapolis Minnesota USA
9. School of Health and Rehabilitation Sciences, College of Medicine The Ohio State University Columbus Ohio USA