Funding for this research was provided by:
Skåne County Council's Research and Development Foundation
Received: 24 April 2020
Accepted: 1 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: Ethical approval has been obtained for POP study at the Regional Ethics Committee at the Lund University, Lund, Sweden (LU 2015/118). Parent provided written informed consent was obtained for all children included in the study. In all adults, new written informed consent was provided.
: Not applicable
: None of the authors has any disclosures or competing interests.