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. 2021 May 7;9:625031. doi: 10.3389/fped.2021.625031

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Copyright © 2021 Chen, Zhong, Han, Yao, Zhao, Wagenaar, Yang and Walther.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flowchart of case selection and analysis. Two hundred fifty-four extremely premature infants were enrolled in this study. BPD, bronchopulmonary dysplasia. CBC, complete blood counts.