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. 2022 Oct 28;12:18136. doi: 10.1038/s41598-022-23039-6

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© The Author(s) 2022

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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Injection technique with the aflibercept prefilled syringe (PFS). (A) Instructions for depressing the plunger rod to align the cylindrical base of the plunger dome edge with the black dosing line on the PFS. (B) and (C) Correct alignment of the plunger rod. (D) Incorrect alignment with the cylindrical base slightly beneath the dosing line. In a daily routine, perfect alignment may not always be achieved (Images A and B are taken from the manufacturer’s guideline: Eylea SmPC, © Bayer (Switzerland) AG).