No abstract available
MeSH terms
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Birth Weight
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Blood Pressure
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Cardiac Catheterization
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Female
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Heart Auscultation*
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Humans
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Infant, Newborn
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Infant, Newborn, Diseases / diagnosis*
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Infant, Premature
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Male
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Phonocardiography
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Pulmonary Artery / growth & development
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Pulmonary Valve Stenosis / diagnosis*
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Time Factors
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Vascular Resistance