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Ronsen O, Sundgot-Borgen J, Maehlum S.Ronsen O, et al.Scand J Med Sci Sports. 1999 Feb;9(1):28-35. doi: 10.1111/j.1600-0838.1999.tb00203.x.Scand J Med Sci Sports. 1999.PMID: 9974194