1 Department of Rehabilitation Medicine, University of Washington, Seattle, WA, United States.
2 Department of Surgery, Harborview Medical Center, University of Washington, Seattle, WA, United States.
3 Department of Surgery, University of Texas Medical Branch, and Shriners Hospital for Children, Galveston, TX, United States.
4 Department of Physical Medicine and Rehabilitation, University of Texas Southwestern Medical Center, Dallas, TX, United States. Electronic address: [email protected].
5 Department of Physical Medicine & Rehabilitation, Harvard Medical School, Spaulding Rehabilitation Hospital, Boston, MA, United States.