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  Author details 
  1Duke Clinical Research Institute, Duke University, 2400 Pratt Street, Durham, 
  NC 27705, USA. 2Department of Physical Therapy, College of Public Health & 
  Health Professions, University of Florida, Box 100154, UFHSC, Gainesville, FL 
  32610-0154, USA. 3Brooks Rehabilitation Clinical Research Center, 3901 
  University Blvd. South, Suite 103, Jacksonville, FL 32216, USA. 4Duke Clinical 
  Research Institute, Department of Orthopaedic Surgery, Duke University, 2400 
  Pratt Street, Durham, NC 27705, USA. 