Knutsen, Linn E.
Dissen, Erik
Saether, Per C.
Bjørnsen, Elisabeth Gyllensten
Piálek, Jaroslav
Storset, Anne K.
Boysen, Preben http://orcid.org/0000-0002-0084-1251
Article History
Received: 11 October 2018
Accepted: 30 November 2018
First Online: 10 December 2018
Compliance with ethical standards
:
: The authors declare no financial or commercial conflicts of interest to the content of this article.