Anttila, Katja
Couturier, Christine S.
Øverli, Øyvind
Johnsen, Arild
Marthinsen, Gunnhild
Nilsson, Göran E.
Farrell, Anthony P.
Article History
Received: 6 May 2014
Accepted: 28 May 2014
First Online: 24 June 2014
Competing interests
: The authors declare no competing financial interests.