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S. M. Gross is a research associate, Y. Bronner is an assistant professor, and D. M. Paige is a professor in the Department of Maternal and Child Health of The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md, USA
L. E. Caulfield is an assistant professor, M. E. Bentley is an associate professor, and J. Jensen is a doctoral candidate at the Center for Human Nutrition of The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md, USA
L. E. Caulfield is an assistant professor, M. E. Bentley is an associate professor, and J. Jensen is a doctoral candidate at the Center for Human Nutrition of The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md, USA
S. M. Gross is a research associate, Y. Bronner is an assistant professor, and D. M. Paige is a professor in the Department of Maternal and Child Health of The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md, USA
L. E. Caulfield is an assistant professor, M. E. Bentley is an associate professor, and J. Jensen is a doctoral candidate at the Center for Human Nutrition of The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md, USA
S. M. Gross is a research associate, Y. Bronner is an assistant professor, and D. M. Paige is a professor in the Department of Maternal and Child Health of The Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md, USA