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. N Engl J Med. 1971 Apr 15;284(15):878-81. doi: 10.1056/NEJM197104222841604. N Engl J Med. 1971. PMID: 5549830 No abstract available. . Dagan N, et al. Nat Med. 2021 Sep 7. doi: 10.1038/s41591-021-01490-8. Online ahead of print. Nat Med. 2021. PMID: 34493859 .