1 University of Michigan, Department of Physical Medicine & Rehabilitation, 325 E Eisenhower Pkwy, Ste 100, Ann Arbor, MI 48108(∗). Electronic address: srsz@med.umich.edu.
2 Good Shepherd Rehabilitation Hospital, Allentown, PA(†).
3 University of Michigan, Department of Physical Medicine & Rehabilitation, 325 E Eisenhower Pkwy, Ste 100, Ann Arbor, MI 48108(‡).