1. P Beattie, PT, PhD, OCS, is Clinical Associate Professor, Program in Physical Therapy, Department of Exercise Science, School of Public Health, University of South Carolina, Columbia, SC 29208 (USA)
2. M Dowda, DrPH, is Biostatistician, Department of Exercise Science, School of Public Health, University of South Carolina
3. C Turner, PT, was Clinical Specialist, MedRisk, Inc, King of Prussia, Pa, at the time this study was completed
4. L Michener, PT, PhD, ATC, SCS, is Assistant Professor, Department of Physical Therapy, Virginia Commonwealth University–Medical College of Virginia Campus, Richmond, Va
5. R Nelson, PT, PhD, FAPTA, is Professor, Department of Physical Therapy, Lebanon Valley College, Annville, Pa. He is also Vice President, Expert Clinical Benchmarks, LLC, MedRisk, Inc