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. 2021 Apr 6;9(5):1211–1221. doi: 10.1007/s43390-021-00334-2

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© The Author(s) 2021

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/.

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Fig. 1 — Workflow of the modified Delphi process. Blue boxes refer to work of current paper. Green boxes refer to a previously published systematic review [20]. Grey boxes are described in methods section under “Delphi procedure”, but due to complexity and the required descriptions the relevant case-mix and risk factors are out of scope of this study