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Herda TJ, Walter AA, Costa PB, Ryan ED, Hoge KM, Stout JR, Cramer JT.Herda TJ, et al.Physiol Meas. 2011 Oct;32(10):1591-603. doi: 10.1088/0967-3334/32/10/007. Epub 2011 Aug 30.Physiol Meas. 2011.PMID: 21878708Clinical Trial.