1. Department of Physical Medicine and Rehabilitation, the Perelman School of Medicine The University of Pennsylvania Philadelphia Pennsylvania USA
2. Department of Physical Medicine & Rehabilitation, Electrodiagnostic and Spine Sections, VA North Texas Health Care System, Dallas VA Medical Center University of Texas Southwestern Medical Center Dallas Texas USA
3. Musculoskeletal Spine & Sports Rehabilitation Medicine, MossRehab, Einstein Spine Institute, Einstein Healthcare Network, Rehabilitation Medicine Thomas Jefferson University Philadelphia Pennsylvania USA