International standards for newborn weight, length, and head circumference by gestational age and sex: the Newborn Cross-Sectional Study of the INTERGROWTH-21st Project - Villar, J; Cheikh Ismail, L; Victora, C G; International Fetal and Newborn Growth Consortium for the 21st Century (INTERGROWTH-21st) (Lancet, 2014)
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