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Ainsworth BE, Bassett DR Jr, Strath SJ, Swartz AM, O'Brien WL, Thompson RW, Jones DA, Macera CA, Kimsey CD.Ainsworth BE, et al. Among authors: strath sj.Med Sci Sports Exerc. 2000 Sep;32(9 Suppl):S457-64. doi: 10.1097/00005768-200009001-00004.Med Sci Sports Exerc. 2000.PMID: 10993415