Otterstad, Jan Erik
Norum, Ingvild Billehaug
Ruddox, Vidar
Bendz, Bjørn
Haugaa, Kristina H.
Edvardsen, Thor
Article History
Received: 7 February 2020
Accepted: 23 March 2020
First Online: 31 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.