1. Department of Orthopaedics Emory University School of Medicine Atlanta Georgia USA
2. Department of Rehabilitation Medicine Medstar Georgetown University Hospital Washington District of Columbia USA
3. Department of Biomechanics University of Nebraska at Omaha Omaha Nebraska USA
4. Department of Physical Medicine and Rehabilitation, Radiology, and Clinical Anatomy Mayo Clinic Rochester Minnesota USA
5. Department of Physical Medicine and Rehabilitation Uniformed Services University of the Health Sciences Bethesda Maryland USA