Funding for this research was provided by:
Belgian Federal Science Policy Office (EOS project 30565447)
Received: 4 May 2020
Accepted: 7 January 2021
First Online: 13 January 2021
Ethics approval and consent to participate
: This study was conducted with the approval of the Ethics committee of the University of Liège—2005/181 and all participants gave 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.