Created at	Source	Raw Value	Validated value
Oct. 26, 2020, 11:31 p.m.	usa	Severity and duration of disease as evidenced by COVID-19 symptoms using the FLU-PRO© questionnaire.;Concentration of serum total 25-hydroxyvitamin D maintained at or above 50 ng/mL.	Severity and duration of disease as evidenced by COVID-19 symptoms using the FLU-PRO© questionnaire.;Concentration of serum total 25-hydroxyvitamin D maintained at or above 50 ng/mL.