1. International Spine, Pain & Performance Center Washington DCU.S.A.
2. George Washington University Washington DCU.S.A.
3. Division of Pain Medicine Virginia Hospital Center Arlington VirginiaU.S.A.
4. Department of Physical Medicine and Rehabilitation MedStar Georgetown University Hospital Washington DCU.S.A.
5. Department of Physical Medicine and Rehabilitation Harvard Medical School Spaulding Rehabilitation Hospital Charlestown MassachusettsU.S.A.
6. Division of Sports and Musculoskeletal Rehabilitation Department of Physical Medicine and Rehabilitation Harvard Medical School Spaulding Rehabilitation Hospital Charlestown Massachusetts U.S.A.