Funding for this research was provided by:
This study was financed by grants from the Swedish state under the agreement between the Swedish government and the county councils, the ALF agreement (ALFGBG-431391)
Received: 11 July 2019
Accepted: 5 March 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: The study was approved by <i>the regional ethical review board in Gothenburg,</i> Sweden (2015-10-16, ref.: 668–15).All participants gave their written informed consent.
: Not applicable.
: KG, LW and IJ declare that they have no competing interests.