Received: 12 July 2020
Accepted: 3 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: The regional ethical review board in Gothenburg, Sweden approved the study protocol, registration number: 8883–12 with additional approval: T784–13. The project was conducted according to the Declaration of Helsinki. Written informed consent was obtained from all participants prior to participation. All participants were informed verbally and in writing about the study purpose and they were all assured that they could withdraw their consent at any time without consequences.
: Not applicable.
: The authors declare that they have no competing interests.