1. Robert Wood Johnson Foundation Health and Society Scholars Program, University of California, San Francisco and University of California, Berkeley, CA 94118, USA
2. Department of Psychology, University of California, Los Angeles, CA 90095-1563, USA
3. Department of Psychiatry, Research Centre of the Douglas Mental Health University Institute, McGill University, Montreal, Quebec, Canada H4H1R3
4. Department of Psychiatry & Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, CA 90095, USA
5. Department of Neuroscience, Loras College, Dubuque, IA, USA 52011