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Frequency and impact of confounding by indication and healthy vaccinee bias in observational studies assessing influenza vaccine effectiveness: a systematic review
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| November 2023 | December 2023 | January 2024 | February 2024 | March 2024 | April 2024 | May 2024 | |
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| Frequency ... | 22 | 20 | 35 | 12 | 9 | 3 | 0 |
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