Additional file 3 of Noninvasive respiratory support for COVID-19 patients: when, for whom, and how?

Additional file 3: Text S3. Prone positioning

Additional file 2 of Noninvasive respiratory support for COVID-19 patients: when, for whom, and how?

Additional file 2: Text S2. Historical use and efficacy of noninvasive respiratory support

Additional file 1 of Noninvasive respiratory support for COVID-19 patients: when, for whom, and how?

Additional file 1: Text S1. Noninvasive respiratory support strategies