Hagbom, Marie
Nordgren, Johan
Nybom, Rolf
Hedlund, Kjell-Olof
Wigzell, Hans
Svensson, Lennart
Article History
Received: 27 November 2014
Accepted: 13 May 2015
First Online: 23 June 2015
Competing interests
: The authors declare no competing financial interests.