Affiliation: | aB. Haughton is an associate professor in the Department of Nutrition, College of Human Ecology, University of Tennessee, Knoxville, USA;bM. Story is an associate professor in the Division of Epidemiology, School of Public Health, University of Minnesota, Minneapolis, USA;cB. Keir is director of public health nutrition with the Bureau of Nutrition Services, Texas Department of Health, Austin, USA |