Ljungman, C
Kahan, T
Schiöler, L
Hjerpe, P
Wettermark, B
Boström, K B
Manhem, K
Article History
Received: 15 June 2014
Revised: 1 September 2014
Accepted: 15 September 2014
First Online: 6 November 2014
Competing interests
: The authors declare no conflict of interest.