1. Department of Dietetics and Nutrition, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
2. Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
3. Arkansas Children's Hospital Research Institute, Little Rock, Arkansas, USA.
4. United States Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota, USA.
5. Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
6. Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.