1. Department of Kinesiology & Community Health, University of Illinois at Urbana-Champaign, Urbana, Illinois.
2. Integrative Immunology & Behavior Program, University of Illinois at Urbana-Champaign, Urbana, Illinois.
3. Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois.
4. Department of Pathology, University of Illinois at Urbana-Champaign, Urbana, Illinois.