Received: 18 November 2020
Accepted: 13 January 2021
First Online: 20 February 2021
Ethics approval and consent to participate
: The study was approved by the Norwegian Regional Committee for Medical Research Ethics (REK South-East, 2017/665). All participants provided a written informed consent. Our study was performed in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.