Characteristics of included subjects of the study cohort and all very preterm infants (VPI) admitted to our unit during the study period.

Characteristics of included subjects of the study cohort and all very preterm infants (VPI) admitted to our unit during the study period.本研究队列纳入的受试者与研究期间收治于本科室的所有极早早产儿（Very Preterm Infants, VPI）的特征