- Correspondence to Professor Lars Engebretsen, Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, Sognsveien 220, PB 4014 Ullevaal Stadion, Oslo NO-0806, Norway;
- Accepted January 10, 2015
- First published February 2, 2015.
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.