Børing, Pål http://orcid.org/0000-0002-5810-7906
Article History
Received: 24 September 2018
Revised: 27 January 2019
Accepted: 8 March 2019
First Online: 16 March 2019
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by the author.