1. Department of Physical Therapy and Rehabilitation Sciences, Drexel University, Philadelphia, Pennsylvania, USA;
2. Department of Physical Therapy, Yonsei University, Wonju, Ganwon-do, South Korea;
3. Orelena Hawks Puckett Institute, Asheville, North Carolina, USA;
4. Department of Epidemiology and Biostatistics, Drexel University, Philadelphia, Pennsylvania, USA