- Correspondence to Grethe Myklebust, Department of Sports Medicine, Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, PO Box 4014 Ullevål Stadion, Oslo 0806, Norway;
- Received October 6, 2012
- Revised January 9, 2013
- Accepted January 16, 2013
- First published February 12, 2013.
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