1. School of Physical Therapy, Texas Woman’s University, Houston, Texas, USA;
2. TIRR-Memorial Hermann Rehabilitation and Research Out-Patient Medical Specialty Clinic, Post-Polio Clinic, Houston, Texas, USA;
3. Physical Therapy Department, Lyndon B Johnson Hospital, Houston, Texas, USA;
4. Vitalico, Houston, Texas, USA;
5. Center for Research Design and Analysis, Office of Research and Sponsored Programs, Texas Woman's University, Houston, Texas, USA