1. Department of Nutrition, Exercise, and Sports, University of Copenhagen, DK-1958 Frederiksberg, Denmark
2. Department of Production Animals and Horses, University of Copenhagen, DK-1958 Frederiksberg, Denmark
3. USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX 77030
4. Department of Health and Sport Science, University of Memphis, Memphis, TN 38152