Karlsson, L
Zackrisson, A-L
Josefsson, M
Carlsson, B
Green, H
Kugelberg, F C
Article History
Received: 10 February 2014
Revised: 27 June 2014
Accepted: 8 July 2014
First Online: 23 September 2014
Competing interests
: The authors declare no conflict of interest.