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