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Walsh LJ, Wong CA, Oborne J, Cooper S, Lewis SA, Pringle M, Hubbard R, Tattersfield AE.Walsh LJ, et al. Among authors: hubbard r.Thorax. 2001 Apr;56(4):279-84. doi: 10.1136/thorax.56.4.279.Thorax. 2001.PMID: 11254818Free PMC article.Clinical Trial.
Hubbard R, Lewis S, Richards K, Johnston I, Britton J.Hubbard R, et al.Lancet. 1996 Feb 3;347(8997):284-9. doi: 10.1016/s0140-6736(96)90465-1.Lancet. 1996.PMID: 8569361
Wong CA, Walsh LJ, Smith CJ, Wisniewski AF, Lewis SA, Hubbard R, Cawte S, Green DJ, Pringle M, Tattersfield AE.Wong CA, et al. Among authors: hubbard r.Lancet. 2000 Apr 22;355(9213):1399-403. doi: 10.1016/S0140-6736(00)02138-3.Lancet. 2000.PMID: 10791523
Venn A, Lewis S, Cooper M, Hubbard R, Hill I, Boddy R, Bell M, Britton J.Venn A, et al. Among authors: hubbard r.Occup Environ Med. 2000 Mar;57(3):152-8. doi: 10.1136/oem.57.3.152.Occup Environ Med. 2000.PMID: 10810096Free PMC article.
Clark M, Cooper B, Singh S, Cooper M, Carr A, Hubbard R.Clark M, et al. Among authors: hubbard r.Thorax. 2001 Jun;56(6):482-6. doi: 10.1136/thorax.56.6.482.Thorax. 2001.PMID: 11359966Free PMC article.
McKeever TM, Lewis SA, Smith C, Collins J, Heatlie H, Frischer M, Hubbard R.McKeever TM, et al. Among authors: hubbard r.Thorax. 2001 Oct;56(10):758-62. doi: 10.1136/thorax.56.10.758.Thorax. 2001.PMID: 11562513Free PMC article.