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Shearer RJ, Constable AR, Girling M, Hendry WF, Fergusson JD.Shearer RJ, et al. Among authors: fergusson jd.Br Med J. 1974 May 18;2(5915):362-5. doi: 10.1136/bmj.2.5915.362.Br Med J. 1974.PMID: 4835842Free PMC article.Clinical Trial.