1. From the Department of Pediatrics of the University of Colorado Health Sciences Center, Denver, Colorado; the
2. MRC Childhood Nutrition Research Centre of the Institute of Child Health, University College London, London, United Kingdom; the
3. Children's Nutrition Research Center and the Department of Pediatrics of the Baylor College of Medicine, Houston, Texas; the
4. Department of Pediatrics of the University of Iowa, Iowa City, Iowa; and the
5. Center for Research for Mothers and Children, National Institute of Child Health and Human Development, Bethesda, Maryland.