title: GRIT: concern about external validity.
authors.forename: Jason
authors.initials: J
authors.lastname: Gardosi
mesh_terms: D002657:Child Development; D036861:Delivery, Obstetric; D005260:Female; D005317:Fetal Growth Retardation; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D018579:Patient Selection; D011247:Pregnancy; D016032:Randomized Controlled Trials as Topic; D015203:Reproducibility of Results