1 Department of Psychiatry, Yale University School of Medicin, New Haven, Connecticut; Department of Neuroscience, Yale University School of Medicine, New Haven, Connecticut; Psychiatry and Behavioral Health Services, Yale New Haven Hospital, New Haven, Connecticut; Clinical Neuroscience Division, VA National Center for Posttraumatic Stress Disorder, VA Connecticut Healthcare System, West Haven, Connecticut. Electronic address: john.krystal@yale.edu.