Setting and Population
major malformations
CONGENITAL INFECTION, PRETERM LABOR
The IPISTOSS study was conducted at 2 neonatal units at Karolinska University Hospital in Stockholm, Sweden, and at the neonatal unit at Stavanger University Hospital in Stavanger, Norway. Screening was performed for women admitted to obstetric units with threatening preterm labor. This study included inborn infants (singletons or twins) with a gestational age of 28 weeks 0 days to 32 weeks 6 days, regardless of birth mode. Infants with congenital infection, major malformations, or other conditions deemed contraindicating to participation were excluded.