Olsen, Nils Reidar B. http://orcid.org/0000-0001-8472-5292
Haun, Stefan http://orcid.org/0000-0002-8202-4633
Article History
Received: 12 January 2019
Accepted: 8 October 2020
First Online: 13 December 2020
Competing interests
: The authors declare that they have no competing interests.