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. 2021 Mar 17;116(9):990–997. doi: 10.1111/vox.13090

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© 2021 The Authors. Vox Sanguinis published by John Wiley & Sons Ltd on behalf of International Society of Blood Transfusion.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Fig. 1 — Flowchart of study participants. ^aSome neonates meet more than one exclusion criteria; hence, combined numbers per criterion can exceed the total number of exclusions. GA, gestational age; IVIg, intravenous immunoglobulin.