1. Gail and Gerald Oppenheimer Family Center for Neurobiology of Stress, David Geffen School of Medicine, University of California-Los Angeles (LAK, KT, BDN, JSL, ZJ, EAM), Los Angeles, California
2. Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles (JJK), California
3. Division of Pain Medicine, Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University Medical Center (SM, KTM), Stanford, California
4. Human Performance and Engineering Laboratory, Kessler Foundation Research Center, West Orange and Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, New Jersey (ZJ)
5. Department of Physiology, Feinberg School of Medicine, Northwestern University (MAF, AVA), Chicago, Illinois