Willer, A
Jakobsen, J S
Ohlsson, E
Rapin, N
Waage, J
Billing, M
Bullinger, L
Karlsson, S
Porse, B T
Article History
Received: 4 June 2014
Revised: 1 October 2014
Accepted: 16 October 2014
First Online: 28 October 2014
Competing interests
: The authors declare no conflict of interest.