1. Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
2. Division of Integrative Neuroscience, New York State Psychiatric Institute, New York, NY 10032, USA.
3. Division of Clinical Therapeutics, New York State Psychiatric Institute, New York, NY 10032, USA.
4. Anxiety Disorders Clinic and OCD Research Program, New York State Psychiatric Institute, New York, NY 10032, USA.
5. Department of Physiology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
6. Departments of Psychiatry and Bioengineering, Stanford University School of Medicine, Stanford, CA 94305, USA.