Tuncel, Elif Tugba. “Prognostic Value of the Prognostic Nutritional Index in Severe COVID-19 Infection: Prognostic Nutritional Index And Covid-19 Infection”. Medical Science and Discovery 10, no. 1 (January 17, 2023): 14–17. Accessed April 20, 2024. https://medscidiscovery.com/index.php/msd/article/view/859.