claim: vitamin d sufficiency increased risk for morbidity and mortality in covid-19 patients
evidence_1: this anti-inflammatory effect of vitamin d might prevent cytokine storm in covid-19 patients and may explain the decreased risk of severity and mortality observed in our patients who were vitamin d sufficient.", "the severity of clinical outcomes from covid-19 and mortality were reduced in patients who were vitamin d sufficient.", "conclusion: therefore, it is recommended that improving vitamin d status in the general population and in particular hospitalized patients has a potential benefit in reducing the severity of morbidities and mortality associated with acquiring covid-19.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "evidence that vitamin d supplementation could reduce risk of influenza and covid-19 infections and deaths.")