Received: 26 October 2020
Accepted: 28 January 2021
First Online: 13 February 2021
Ethics approval and consent to participate
: The project is conducted according to the Helsinki declaration and approved by the Regional committee for Medical and Health Research Ethics in Norway (REC no. 2013/2030). Project information and consent form were available in Norwegian and English. All patients have provided written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.