Table 2 Inclusion/Exclusion criteria

Inclusion criteria

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23 0/7 to 28 6/7 weeks using best obstetrical estimate

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7 days of age or less at enrollment

Exclusion criteria

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Concern for viability

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Structurally significant congenital heart disease

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Structural abnormalities of the upper airway, lungs or chest wall

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Congenital malformations or syndromes that adversely affect life expectancy or cardio-pulmonary development

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Family unlikely to be available for long-term follow-up