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. 2022 Oct 18;13:1007102. doi: 10.3389/fimmu.2022.1007102

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Copyright © 2022 Brandwijk, Michels, van Rossum, de Nooijer, Nilsson, de Bruin and Toonen

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Pie charts showing the percentages regarding the used techniques and whether the correct sample types were used for complement assessment. A total of 92 studies were included in the analysis. (A) Percentages regarding the used techniques. Several studies used more than 1 technique for their measurements, hence the number of performed analyses is higher than the total number of the identified studies. (B) Percentages of studies that used/did not used the correct sample type for complement assessment.