1. Central Michigan University College of Medicine, Mount Pleasant, MI, USA
2. Department of Family and Preventive Medicine, University of Utah, Salt Lake City, UT, USA
3. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA
4. Department of Physical Medicine & Rehabilitation, University of Utah, Salt Lake City, UT, USA
5. Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA