No abstract available
MeSH terms
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Humans
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Infant Mortality / trends*
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Infant, Low Birth Weight*
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Infant, Newborn
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Infant, Premature
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Pulmonary Surfactants / therapeutic use*
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Respiratory Distress Syndrome, Newborn / mortality*
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Respiratory Distress Syndrome, Newborn / therapy
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United States / epidemiology