Keskin , O. .; Seremet Keskin , A.; Nilgün Seremet. Association Between Low Serum Folic Acid and Vitamin B12 Levels With COVID-19 Prognosis. Progr Nutr 2022, 24 (3), e2022104. https://doi.org/10.23751/pn.v24i3.13462.