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Shearer RJ, Hendry WF, Ferguson JD.Shearer RJ, et al.Br Med J. 1973 Jul 7;3(5870):51. doi: 10.1136/bmj.3.5870.51.Br Med J. 1973.PMID: 4717432Free PMC article.Clinical Trial.No abstract available.
Shearer RJ, Constable AR, Girling M, Hendry WF, Fergusson JD.Shearer RJ, et al.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.