Paul H. Lento, MD a, b, ⁎ , William J. Sullivan, MD c, d
a Rehabilitation Institute of Chicago Spine, Sports, and Rehabilitation Center, 1030 North Clark, Chicago, IL 60611, USA
b Department of Physical Medicine and Rehabilitation, Northwestern University Feinberg School of Medicine, 345 East Superior Street, Chicago, IL 60611, USA
c University of Colorado Health Sciences Center, The Spine Center at University Hospital, PO Box 6508, MS F493, Aurora, CO 80045, USA
d Department of Physical Medicine and Rehabilitation, University of Colorado School of Medicine, PO Box 6508, MS F493, Aurora, CO 80045, USA