1. Metabolism Unit, Shriners Hospitals for Children, Galveston, Texas;
2. Department of Surgery, University of Texas Medical Branch, Galveston, Texas;
3. Arkansas Children's Nutrition Center and Arkansas Children's Hospital Research Institute, Little Rock, Arkansas;
4. Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas;
5. Division of Rehabilitation Sciences, University of Texas Medical Branch, Galveston, Texas;
6. Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, Texas; and
7. Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas