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A growing body of evidence based on meta-analyses, observational prospective and retrospective studies, and interventional studies has shown associations between hypovitaminosis D and the occurrence of acute severe COVID-19, including an elevated risk of admission at the ICU, length of stay at the ICU, need for mechanical ventilation and mortality [75,273,274]

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Some cases have been reported in patients with a clinical history of oral contraceptive usage [13] or psoralen ultraviolet A (PUVA) treatment [16]

Estimation of total, protein-bound, and nonprotein sulfhydryl groups in tissue with Ellmans reagent