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Effect of HDIVC on preventing the disease aggravation. The number of patients who experienced disease aggravation in HDIVC and the control group were compared (4/55 vs 12/55, RR = 0.28 [0.08, 093], P = 0.03). HDIVC, high dose intravenous vitamin C; COVID-19, coronavirus disease 2019; RR, relative risk; CI, confidential interval.
