Vitamin D 25OH Deficiency and Mortality in Moderate to Severe COVID-19: A Multi-Center Prospective Observational Study by Laura Bogliolo, Emanuele Cereda, Catherine Klersy, Ludovico De Stefano, Federica Lobascio, Sara Masi, Silvia Crotti, Serena Bugatti, Carlomaurizio Montecucco, Stefania Demontis, Annalisa Mascheroni, Nadia Cerutti, Alberto Malesci, Salvatore Corrao, Salvatore Corrao, Riccardo Caccialanza, The NUTRI-COVID19 Collaborative Working Group

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