1. University of Utah Department of Physical Therapy and Athletic Training, , Salt Lake City, Utah, USA
2. Brown University School of Public Health Department of Health Services, Policy & Practice, , Providence, Rhode Island, USA
3. Providence Veteran’s Administration Medical Center , Providence, Rhode Island, USA
4. University of Utah Study Design and Biostatistics Center, , Salt Lake City, Utah, USA
5. University of Utah Department of Internal Medicine, , Salt Lake City, Utah, USA
6. University of Pittsburgh Department of Physical Therapy, , Pittsburgh, Pennsylvania, USA