Frankowiack, M
Kovanen, R-M
Repasky, G A
Lim, C K
Song, C
Pedersen, N L
Hammarström, L
Article History
Received: 29 August 2014
Revised: 30 October 2014
Accepted: 31 October 2014
First Online: 8 January 2015
Competing interests
: The authors declare no conflict of interest.