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Rudd P, Carrington D.Rudd P, et al.Br Med J (Clin Res Ed). 1983 May 21;286(6378):1649. doi: 10.1136/bmj.286.6378.1649-b.Br Med J (Clin Res Ed). 1983.PMID: 6405924Free PMC article.No abstract available.