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Retraction Note: Picture fuzzy set-based decision-making approach using Dempster-Shafer theory of evidence and grey relation analysis and its application in COVID-19 medicine selection

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[This retracts the article DOI: 10.1007/s00500-021-05909-9.]. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023.