- Correspondence to Dr Kathrin Steffen, Department of Sports Medicine, Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, Pb 4014 Ulleval Stadion, Oslo 0806, Norway;
- Accepted March 4, 2013
- First published April 4, 2013.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.