1. Department of Psychology, University of California, Los Angeles, Los Angeles, CA, USA
2. Department of Psychology, University of British Columbia, Vancouver, Canada
3. Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience & Human Behavior, University of California, Los Angeles, Los Angeles, CA, USA
4. Department of Psychological Science, University of California, Irvine, Irvine, CA, USA
5. Institute for Interdisciplinary Salivary Bioscience, University of California, Irvine, Irvine, CA, USA