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Shapiro SH, Ernst P, Gray-Donald K, Martin JG, Wood-Dauphinee S, Beaupré A, Spitzer WO, Macklem PT.Shapiro SH, et al. Among authors: martin jg.Lancet. 1992 Dec 12;340(8833):1425-9. doi: 10.1016/0140-6736(92)92620-u.Lancet. 1992.PMID: 1360558Clinical Trial.