1 Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center, TIRR Memorial Herman Hospital, Houston, TX(∗).
2 Department of Physical Medicine & Rehabilitation, University of Pittsburgh Medical Center, Pittsburgh, PA(†).
3 Department of Rehabilitation Medicine, Weill Cornell Medical Center, 525 E 68th St, F-1600, New York, NY 10065(‡). Electronic address: mio2005@med.cornell.edu.