1. Louis Stokes Cleveland Department of Veterans Affairs Medical Center (LSCDVAMC), Cleveland, Ohio, US;
2. Department of Epidemiology & Biostatistics, Case Western Reserve University, Cleveland, Ohio, US;
3. The Ohio College of Podiatric Medicine, Cleveland, Ohio, US;
4. Department of Orthopaedics, Case Western Reserve University, Cleveland, Ohio, US;
5. Division of Physical Medicine & Rehabilitation, University of Calgary, Calgary, Canada.