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De Lacey G, Benson M, Wilkins R, Spencer J, Cramer B.De Lacey G, et al.Br Med J (Clin Res Ed). 1982 Apr 3;284(6321):1021-2. doi: 10.1136/bmj.284.6321.1021.Br Med J (Clin Res Ed). 1982.PMID: 6802391Free PMC article.Clinical Trial.
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