1. Department of Physical Medicine and Rehabilitation, Vanderbilt University, Nashville, Tennessee
2. Department of Anesthesiology, Perioperative Care, and Pain Medicine, NYU School of Medicine, New York, New York, USA
3. Department of Anesthesia, Pain Clinic, A.Z. Jan Portaels, Vilvoorde, Belgium, Rugpoli Brabant/Kliniek, Tilburg, the Netherlands
4. Southern Brain and Spine, New Orleans, Louisiana
5. Legacy Spine and Pain Rehabilitation, Bethesda, Maryland
6. Faculty of Health and Medicine, University of Newcastle, Newcastle, Australia