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Newborn Infant
Very Low Birth Weight Infant
Asphyxia Neonatorum
Bulgaria
Infant Mortality
Retrospective Studies
Premature Infant
Low Birth Weight Infant
Causes of Death
Risk Factors
Pregnancy
Gestational Age
Apgar Score
Hospitals, Maternity
Oxygen
Pulmonary Surfactants
Obstetric Delivery
Artificial Respiration
Intensive Care, Neonatal
Fetal Blood
Co-Publications
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13
9
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5
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3
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