Determining whether birth-dose hepatitis B virus vaccination of preterm infants affects risk of bronchopulmonary dysplasia: a cohort study. Supplemental files.

<p dir="ltr">Supplemental files S1-S3 for manuscript 'Determining whether birth-dose hepatitis B virus vaccination of preterm infants affects risk of bronchopulmonary dysplasia: a cohort study' published by The Bulletin of the World Health Organization.</p>