1. Department of Physical Therapy, University of Pittsburgh, Pittsburgh, Pennsylvania
2. Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Institute of Health Policy, Management and Evaluation, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
4. Department of Family Medicine, Alpert Medical School of Brown University, Providence, Rhode Island
5. Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania
6. Department of Physical Medicine Rehabilitation, University of Pittsburgh, Pittsburgh, Pennsylvania
7. College of Allied Health, University of Oklahoma Health Sciences Center, Oklahoma City
8. Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
9. Department of Statistics, College of Science, Virginia Polytechnic Institute and State University, Blacksburg
10. Department of Orthopedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania