Funding for this research was provided by:
Western Norway Health Authority (912184)
Received: 29 August 2019
Accepted: 14 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: Procedures were consistent with the World Medical Association’s ethical guidelines and the Helsinki declaration. Informed consent was obtained from all patients. The signed informed consent form was kept in secure premises, and confidentiality of study data was assured. The protocol was approved by the Norwegian Regional Committee for Ethics in Medical Research (REK 2015/57).
: Not applicable.
: The authors declare that they have no competing interests.