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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
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abstractpubmed· Abstract· item 34724407
BioNTech/Pfizer vaccine after Oxford/AZ vaccine increased immune response vs. no second vaccine. Borobia AM, Carcas AJ, Perez-Olmeda M, et al. Immunogenicity and reactogenicity of BNT162b2 booster in ChAdOx1-S-primed participants (CombiVacS): a multicentre, open-label, randomised, controlled, phase 2 trial. Lancet. 2021;398:121-30. 34181880.