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Bjarnason I, Smethurst P, Fenn CG, Lee CE, Menzies IS, Levi AJ.Bjarnason I, et al. Among authors: fenn cg.Dig Dis Sci. 1989 Mar;34(3):407-11. doi: 10.1007/BF01536263.Dig Dis Sci. 1989.PMID: 2493366Clinical Trial.
Shield MJ, Fenn CG.Shield MJ, et al. Among authors: fenn cg.Lancet. 1989 Jan 14;1(8629):98-9. doi: 10.1016/s0140-6736(89)91453-0.Lancet. 1989.PMID: 2562901No abstract available.