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Gennery AR, Cant AJ, Spickett GP, Walshaw D, Hunter S, Hasan A, Hamilton JR, Dark J.Gennery AR, et al.Lancet. 1998 Jun 13;351(9118):1778-81. doi: 10.1016/s0140-6736(97)08486-9.Lancet. 1998.PMID: 9635951Clinical Trial.