Korpela, Katri
Blakstad, Elin W.
Moltu, Sissel J.
Strømmen, Kenneth
Nakstad, Britt
Rønnestad, Arild E.
Brække, Kristin
Iversen, Per O.
Drevon, Christian A.
de Vos, Willem
Article History
Received: 5 July 2017
Accepted: 24 January 2018
First Online: 6 February 2018
Competing Interests
: The authors declare that they have no competing interests.