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Loucera C, Pe\'f1a-Chilet M, Esteban-Medina M, et al. Real world evidence of calcifediol or vitamin D prescription and mortality rate of COVID-19 in a retrospective cohort of hospitalized Andalusian patients. Sci Rep. 2021;11(1):23380. doi:10.1038/s41598-021-02701-5.\par \par }