Early Variation of ROX Index Predicts High-Flow Nasal Cannula Outcome in Awake Subjects With Severe Hypoxemic COVID-19. - Abroug, Fekri; Hammouda, Zeineb; Lahmar, Manel; Nouira, Wiem; Maatouk, Syrine; Youssef, Sourour Belhaj; Dachraoui, Fahmi; Brochard, Laurent; Ouanes-Besbes, Lamia (Respiratory Care, 2023)