1. Department of Anesthesiology, and the Chronic Pain and Fatigue Research Center, University of Michigan, Ann Arbor, Michigan
2. Department of Neurology, Bergmannsheil, Ruhr University Bochum, Bochum, Germany
3. Gail and Gerald Oppenheimer Family Center for Neurobiology of Stress, David Geffen School of Medicine at UCLA, Los Angeles, California
4. Department of Anesthesiology, Division of Pain Medicine, Stanford University Medical Center, Stanford, California
5. Department of Physiology, Northwestern University, Feinberg School of Medicine, Chicago, Illinois
6. Departments of Radiology and Anesthesiology, University of Alabama, Birmingham Medical Center, Birmingham, Alabama
7. Department of Radiology, University of Washington, Seattle, Washington