Biering-Sørensen, F
Bryden, A
Curt, A
Friden, J
Harvey, L A
Mulcahey, M J
Popovic, M R
Prochazka, A
Sinnott, K A
Snoek, G
Article History
Received: 4 February 2014
Revised: 28 April 2014
Accepted: 3 May 2014
First Online: 3 June 2014
Competing interests
: The authors declare no conflict of interest.