Björk, Y
Smith Knutsson, E
Ankarberg-Lindgren, C
Broman, A-K
Andersson, I
Björkman, L
Magnusson, J
Bergmark, K
Anderson, H
Andersson, P-O
Brune, M
Article History
Received: 16 May 2016
Revised: 3 September 2016
Accepted: 7 September 2016
First Online: 12 December 2016
Competing interests
: The authors declare no conflict of interest.