Grövdal, M
Nahi, H
Gahrton, G
Liwing, J
Waage, A
Abildgaard, N
Pedersen, P T
Hammerstrøm, J
Laaksonen, A
Bazia, P
Terava, V
Ollikainen, H
Silvennoinen, R
Putkonen, M
Anttila, P
Porkka, K
Remes, K
Article History
Received: 10 December 2014
Revised: 17 January 2015
Accepted: 2 February 2015
First Online: 13 April 2015
Competing interests
: The authors declare no conflict of interest.