1 Department of Physical Medicine and Rehabilitation, School of Medicine, University of Colorado, Aurora, CO. Electronic address: andrew.c2.smith@cuanschutz.edu.
2 Department of Physical Medicine and Rehabilitation, School of Medicine, University of Colorado, Aurora, CO; Craig Hospital, Englewood, CO.
3 Department of Physical Medicine and Rehabilitation, School of Medicine, University of Colorado, Aurora, CO.
4 Department of Physical Medicine and Rehabilitation, School of Medicine, University of Colorado, Aurora, CO.
5 Department of Neurosurgery, School of Medicine, University of Colorado, Aurora, CO.
6 University of Udine, Department of Medicine, Udine, Italy; Kessler Foundation, West Orange, NJ, USA.
7 Craig Hospital, Englewood, CO.
8 Craig Hospital, Englewood, CO.
9 Craig Hospital, Englewood, CO.
10 Department of Anesthesiology, Perioperative and Pain Medicine, School of Medicine, Stanford University, Palo Alto, CA.