Received: 21 July 2021
Accepted: 4 September 2021
First Online: 16 September 2021
: This is an ancillary study of an observational study on acute respiratory failure in COVID-19 patients approved by the Comité de Protection des Personnes (CPP Nord Ouest IV, no 2020-A03009-30). Patients or their relatives received information that data abstracted from their medical charts could be used for research purposes.
: Not applicable.
: Authors declare no competing interest for this work.