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Kelsey CA, Hixon TJ, Minifie FD.Kelsey CA, et al. Among authors: hixon tj.IEEE Trans Biomed Eng. 1969 Apr;16(2):143-7. doi: 10.1109/tbme.1969.4502627.IEEE Trans Biomed Eng. 1969.PMID: 5804081No abstract available.