Nilssen, Yngvar
Brustugun, Odd Terje
Eriksen, Morten Tandberg
Guren, Marianne G.
Haug, Erik Skaaheim
Naume, Bjørn
Schlichting, Ellen
Møller, Bjørn
Article History
Received: 2 July 2021
Accepted: 17 February 2022
First Online: 28 February 2022
Declarations
:
: The Norwegian Regional Ethics Committee concluded that no approval was needed for this study (reference number: 2017/428REK sør-øst A). Thus, they gave the authors exemption from the statutory duty of confidentiality. The approval of handling indirect identifiable data was obtained from the Data Protection Officer (PVO) (reference number: 2017/6597). All methods were performed in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.