Zinellu, Angelo, Andrea De Vito, Valentina Scano, Panagiotis Paliogiannis, Vito Fiore, Giordano Madeddu, Ivana Maida, et al. “The PaO2 FiO2 Ratio on Admission Is Independently Associated With Prolonged Hospitalization in COVID-19 Patients”. The Journal of Infection in Developing Countries 15, no. 03 (March 31, 2021): 353–359. Accessed April 20, 2024. https://jidc.org/index.php/journal/article/view/33839709.