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Frey Law LA, Lee JE, McMullen TR, Xia T.Frey Law LA, et al.Appl Ergon. 2010 Dec;42(1):9-15. doi: 10.1016/j.apergo.2010.03.007. Epub 2010 May 13.Appl Ergon. 2010.PMID: 20462566Free PMC article.