1. Department of Anesthesiology and Pain Medicine, University of Washington , Seattle, Washington, USA
2. Department of Rehabilitation Medicine, University of Washington , Seattle, Washington, USA
3. Department of Psychiatry, Massachusetts General Hospital, Spaulding Rehabilitation Hospital, Harvard Medical School , Boston, Massachusetts , USA
4. Department of Psychiatry, University of Texas Southwestern Medical Center , Dallas, Texas , USA
5. Department of Surgery, University of Washington , Seattle, Washington, USA
6. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital and Spaulding Research Institute, Harvard Medical School , Boston, Massachusetts , USA