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. 2022 Dec 7;2022(12):CD015477. doi: 10.1002/14651858.CD015477

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Copyright © 2023 The Authors. Cochrane Database of Systematic Reviews published by John Wiley & Sons, Ltd. on behalf of The Cochrane Collaboration.

This is an open access article under the terms of the Creative Commons Attribution-Non-Commercial-No-Derivatives Licence, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Analysis 5.1.3: heterologous vaccination scheme versus homologous vaccination scheme. Outcome: any adverse event (AE).

Liu 2021 included only participants 50 years of age or older.

Liu X 2021.1 and Liu X 2021.2 are different comparisons for the same report (Liu 2021).