Funding for this research was provided by:
European Commission (grant agreement 242141)
Received: 17 July 2020
Accepted: 2 October 2020
First Online: 16 October 2020
Ethics approval and consent to participate
: Ethical approval for the QUALICOPC study was acquired in accordance with the legal requirements in each country [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.