1. Department of Nutritional Sciences, The University of Arizona, Tucson, Arizona
2. Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston, Houston, Texas
3. Department of Pediatrics, The University of Arizona, Tucson, Arizona
4. School of Kinesiology, Louisiana State University, Baton Rouge, Louisiana
5. National Aeronautics and Space Administration Johnson Space Center, Houston, Texas
6. Department of Immunobiology, The University of Arizona, Tucson, Arizona