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Hoffman L, Bann C, Higgins R, Vohr B; Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network.Hoffman L, et al.Pediatrics. 2015 Jun;135(6):1082-92. doi: 10.1542/peds.2014-3880. Epub 2015 May 11.Pediatrics. 2015.PMID: 25963007Free PMC article.