Funding for this research was provided by:
Knut och Alice Wallenbergs Stiftelse
Erling Persson Foundation
Swedish Heart and Lung Foundation
Received: 16 March 2020
Accepted: 11 June 2020
First Online: 23 June 2020
Ethics approval and consent to participate
: The study is approved by the Ethical Review Board of Göteborg, Sweden. All participants provided written informed consent. The study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.