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. 2023 Dec 18;11:94. doi: 10.1186/s40635-023-00577-5

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© The Author(s) 2023

Open Access This 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/.

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Fig. 2 — Overview of different phrenic nerve stimulation techniques that have been applied in critically ill patients. The nomenclature of the stimulation techniques was adopted from the studies in which they were first used for this particular study population. Nevertheless, the terms "EDP" [57] and "DPS" [48] have been marginally revised to improve categorisation, differentiation and comprehensibility with respect to the other existing techniques [11, 52–56]