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. 2021 Sep 24;9:734082. doi: 10.3389/fped.2021.734082

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Copyright © 2021 Engan, Engan, Greve, Vollsæter, Hufthammer and Leirgul.

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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Flow chart of the study population in the study of vascular endothelial function in young adults born very preterm or with extremely low birthweight (PB/ELBW) and term-born controls, part of the Project Extreme Prematurity in Norway.