Vitamin D deficiency predicts 30-day hospital mortality of adults with COVID-19 - Neves, Fábio Fernandes; Pott-Junior, Henrique; Santos, Sigrid de Sousa; Cominetti, Marcia Regina; Freire, Caio César de Melo; Cunha, Anderson Ferreira da; Jordão Junior, Alceu Afonso (Clinical Nutrition ESPEN, 2022)