Funding for this research was provided by:
Icelandic Ministry of Health.
Received: 3 September 2020
Accepted: 1 February 2021
First Online: 27 February 2021
Ethics approval and consent to participate
: The study was approved by the Science Bioethics Committee of Iceland (reference: VSNb2015050022/03.01).
: The authors declare they have no actual or potential competing financial interests.