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Xuan W, Marks GB, Toelle BG, Belousova E, Peat JK, Berry G, Woolcock AJ.Xuan W, et al. Among authors: marks gb.Thorax. 2002 Feb;57(2):104-9. doi: 10.1136/thorax.57.2.104.Thorax. 2002.PMID: 11828037Free PMC article.
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Marks GB, Tovey ER, Green W, Shearer M, Salome CM, Woolcock AJ.Marks GB, et al.Clin Exp Allergy. 1995 Feb;25(2):114-8. doi: 10.1111/j.1365-2222.1995.tb01015.x.Clin Exp Allergy. 1995.PMID: 7750002Clinical Trial.