1. Department of Psychology, University of California, Los Angeles, CA, USA
2. Department of Psychology, Carnegie Mellon University, Pittsburgh, PA, USA
3. Semel Institute for Neuroscience and Human Behavior, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, CA, USA
4. Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles; Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA