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. 2022 Sep 8;23:763. doi: 10.1186/s13063-022-06690-2

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Spirit figure showing specific time points in IVON trials. Note: denotes variables that will be assessed at each visit from the selected time point (X) to the end point depicted by the double-headed arrow. Acceptability of intervention will be assessed pre-trial, and findings used in protocol modification

Inline graphic — Spirit figure showing specific time points in IVON trials. Note: denotes variables that will be assessed at each visit from the selected time point (X) to the end point depicted by the double-headed arrow. Acceptability of intervention will be assessed pre-trial, and findings used in protocol modification