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. 2021 Jun 25;9:695610. doi: 10.3389/fped.2021.695610

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Copyright © 2021 Chen, Zhang, Li, Yan, Wang, Hu, Shi, Du and Zhang.

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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Forest plots of risk factors for developing pulmonary hypertension in infants with BPD. Forest plot for (A) oligohydramnios, (B) cesarean operation, (C) sepsis, (D) multiple births, (E) small for gestational age, (F) BPD severity, and (G) pre-eclampsia. The odds ratio is presented as black boxes, whereas 95% confidence intervals are presented as whiskers. A negative odds ratio represents a reduced risk for developing pulmonary hypertension in infants with BPD, a positive odds ratio represents an increased risk for developing pulmonary hypertension in infants with BPD.