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Martinsen M, Sundgot-Borgen J.Martinsen M, et al.Scand J Med Sci Sports. 2014 Apr;24(2):439-46. doi: 10.1111/j.1600-0838.2012.01505.x. Epub 2012 Jul 26.Scand J Med Sci Sports. 2014.PMID: 22830488