Heggenes, Jan
Fagertun, Christian
Odland, Arvid
Bjerketvedt, Dag K.
Article History
Received: 3 June 2019
Revised: 14 April 2020
Accepted: 26 May 2020
First Online: 7 June 2020
Compliance with ethical standards
:
: There were no conflict of interest associated with this work.