Received: 18 September 2020
Accepted: 24 January 2021
First Online: 26 February 2021
Ethics approval and consent for publication
: The study was approved by the Ethics Committee of CHU Liege B70720096732, reference Liege 2009/161 and each patient signed an informed consent.
: Not applicable.
: The authors declare that they have no competing interests related to this manuscript. Renaud Louis received grants from GSK, Astrazeneca, Novartis and Chiesi and personal fees from GSK, Astrazeneca and Novartis. Florence Schleich received grants from GSK and Astrazeneca and personal fees from GSK and Chiesi. Other co-authors have nothing to declare.