Halvorsen, A.
Pettersen, A. L.
Nilsen, S. M.
Halle, K. Krizak
Schaanning, E. Elmenhorst
Rekand, T. http://orcid.org/0000-0002-2506-9501
Article History
Received: 10 August 2018
Revised: 8 November 2018
Accepted: 8 November 2018
First Online: 14 December 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.