Aging-related predictive factors for oxygenation improvement and mortality in COVID-19 and acute respiratory distress syndrome (ARDS) patients exposed to prone position: A multicenter cohort study Marieta C.A. Cunha; Jociane Schardong; Natiele C. Righi; Adriana C. Lunardi; Guadalupe N. Sant'Anna; Larissa P. Isensee; Rafaela F. Xavier; Jose E. Pompeu; Renata M. Weigert; Darlan L. Matte; Rozana A. Cardoso; Ana C.V. Abras; Antonio M.V. Silva; Camila C. Dorneles; Roberta W. Werle; Ana C. Starke; Juliana C. Ferreira; Rodrigo D.M. Plentz; Celso R.F. Carvalho;