The role of observational studies based on secondary data in studying SARS-CoV-2 vaccines
- PMID: 34906720
- PMCID: PMC8665840
- DOI: 10.1016/j.cmi.2021.12.006
The role of observational studies based on secondary data in studying SARS-CoV-2 vaccines
Comment on
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Nationwide effectiveness of five SARS-CoV-2 vaccines in Hungary-the HUN-VE study.Clin Microbiol Infect. 2022 Mar;28(3):398-404. doi: 10.1016/j.cmi.2021.11.011. Epub 2021 Nov 25. Clin Microbiol Infect. 2022. PMID: 34838783 Free PMC article.
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