title: How small is too small or how early is too early? Epidemiology.
authors.affiliation: National Perinatal Epidemiology Unit, Radcliffe Infirmary, Oxford, England.
authors.forename: A
authors.initials: A
authors.lastname: Macfarlane
authors.forename: A
authors.initials: A
authors.lastname: Johnson
mesh_terms: D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007234:Infant, Premature; D009017:Morbidity