Borgan, Ørnulf http://orcid.org/0000-0002-4687-1202
Gjessing, Håkon K. http://orcid.org/0000-0002-3544-1063
Article History
Received: 17 July 2019
Accepted: 21 August 2019
First Online: 28 August 2019
Free to read: This content has been made available to all.