Birth weight and age-specific analysis of the 1990 US infant mortality drop. Was it surfactant? (Q47315142)

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scientific article published in February 1997
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Birth weight and age-specific analysis of the 1990 US infant mortality drop. Was it surfactant?
scientific article published in February 1997

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    Birth weight and age-specific analysis of the 1990 US infant mortality drop. Was it surfactant? (English)

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