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Carroll N, Bain RJ, Smith PE, Saltissi S, Edwards RH, Calverley PM.Carroll N, et al. Among authors: edwards rh.Eur Respir J. 1991 Apr;4(4):434-40.Eur Respir J. 1991.PMID: 1855572
Carroll N, Clague JE, Pollard MH, Horan MA, Edwards RH, Calverley PM.Carroll N, et al. Among authors: edwards rh.J Med Eng Technol. 1992 Mar-Apr;16(2):82-6. doi: 10.3109/03091909209021965.J Med Eng Technol. 1992.PMID: 1404310