1 Department of Rehabilitation Science, MGH Institute of Health Professions, Boston, MA, USA; Department of Physical Therapy and Rehabilitation Science, MGH Institute of Health Professions, Boston, MA, USA.
2 Department of Rehabilitation Science, MGH Institute of Health Professions, Boston, MA, USA.
3 Athinoula A. Martinos Center for Biomedical Imaging, Harvard Medical School, Massachusetts General Hospital, Charlestown, MA, USA.
4 Department of Physical Therapy and Rehabilitation Science, MGH Institute of Health Professions, Boston, MA, USA; Athinoula A. Martinos Center for Biomedical Imaging, Harvard Medical School, Massachusetts General Hospital, Charlestown, MA, USA. Electronic address: tkimberley@mgh.harvard.edu.