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Steinman L, Doescher M, Keppel GA, Pak-Gorstein S, Graham E, Haq A, Johnson DB, Spicer P.Steinman L, et al.Matern Child Nutr. 2010 Jan;6(1):67-88. doi: 10.1111/j.1740-8709.2009.00185.x.Matern Child Nutr. 2010.PMID: 20055931Free PMC article.