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Butler JE, McKenzie DK, Gandevia SC.Butler JE, et al. Among authors: mckenzie dk.Respir Physiol Neurobiol. 2003 Oct 16;138(1):87-96. doi: 10.1016/s1569-9048(03)00161-7.Respir Physiol Neurobiol. 2003.PMID: 14519380Clinical Trial.