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Article Source: Retraction: Pre-infection 25-hydroxyvitamin D3 levels and association with severity of COVID-19 illness
The PLOS One Editors (2025) Retraction: Pre-infection 25-hydroxyvitamin D3 levels and association with severity of COVID-19 illness. PLOS ONE 20(9): e0331693. https://doi.org/10.1371/journal.pone.0331693

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