1. U.S. Army Medical Research Directorate-West, Walter Reed Army Institute for Research, McChord Air Force Base, WA, USA
2. Geneva Foundation, Tacoma, WA, USA
3. Martin Army Community Hospital, Fort Benning, GA, USA
4. Neuromuscular Research Laboratory/Warrior Human Performance Research Center, University of Pittsburgh, Pittsburgh, PA, USA
5. Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA, USA