Funding for this research was provided by:
Knut och Alice Wallenbergs Stiftelse
Received: 17 December 2019
Accepted: 24 May 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: The study was approved by the regional Swedish Ethical Review Authority (Dnr 948–18) and conducted according to the 1964 Declaration of Helsinki. All participants signed informed consent before entering the study.
: Not applicable.
: The authors declare that they have no competing interests.