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Paton RC, Kernoff PB, Wales JK, McNicol GP.Paton RC, et al.Br Med J (Clin Res Ed). 1981 Oct 17;283(6298):1018-20. doi: 10.1136/bmj.283.6298.1018.Br Med J (Clin Res Ed). 1981.PMID: 6794745Free PMC article.