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Walters RL, Baird IM, Davies PS, Hill MJ, Drasar BS, Southgate DA, Green J, Morgan B.Walters RL, et al.Br Med J. 1975 Jun 7;2(5970):536-8. doi: 10.1136/bmj.2.5970.536.Br Med J. 1975.PMID: 1097036Free PMC article.Clinical Trial.
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