Study population and design
ChiCTR2100041910
The clinical data were obtained from a prospective multicenter study on the effect of SMOF in preterm infants, which was conducted in five tertiary level A hospitals with NICU of level IIIB or above in China between January, 2021 and December, 2021. The study was approved by the Ethics Committee of the Women and Children’s Hospital of Xiamen University (Grant No. KY-2020–0086–01) and it was registered in the China Clinical Trials Registry (Registration No. ChiCTR2100041910) (10/01/2021). Written informed consent was obtained from the parents or guardians of preterm infants included in the study.