- Correspondence to John Bjørneboe, Department of Sports Medicine, Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, PO Box 4014 Ullevaal Stadion, Oslo 0806, Norway;
- Received June 28, 2012
- Revised November 29, 2012
- Accepted December 5, 2012
- First published January 11, 2013.
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