1. Department of Physical Therapy, East Carolina University, Greenville, NC 27834, USA
2. Moss Rehabilitation Research Institute, Elkins Park, PA 19027, USA
3. Department of Physical Therapy, Arcadia University, Glenside, PA 19038, USA
4. Department of Physical Therapy and School of Health and Rehabilitation Sciences Data Center, University of Pittsburgh, Pittsburgh, PA 15260, USA