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The American Journal of Sports Medicine 37 ( 7 ): 1434 - 1443 , 2009
I Eitzen, T. J Eitzen, I Holm, L Snyder Mackler and M. A. Risberg
The American Journal of Sports Medicine 38 ( 3 ): 586 - 593 , 2010
B. E Oiestad, I Holm, A. K Aune, R Gunderson, G Myklebust, L Engebretsen, M. A Fosdahl and M. A. Risberg
The American Journal of Sports Medicine 38 ( 11 ): 2201 - 2210 , 2010