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Hill J, Micklewright A, Lewis S, Britton J.Hill J, et al.Eur Respir J. 1997 Oct;10(10):2225-9. doi: 10.1183/09031936.97.10102225.Eur Respir J. 1997.PMID: 9387944Free article.Clinical Trial.
Venn A, Lewis S, Cooper M, Hill J, Britton J.Venn A, et al.BMJ. 1998 Jun 27;316(7149):1945-6. doi: 10.1136/bmj.316.7149.1945.BMJ. 1998.PMID: 9641931Free PMC article.No abstract available.
Venn A, Lewis S, Cooper M, Hill J, Britton J.Venn A, et al.Eur Respir J. 1998 Jun;11(6):1324-8. doi: 10.1183/09031936.98.11061324.Eur Respir J. 1998.PMID: 9657574Free article.
Hill JM, Thomson NC.Hill JM, et al.Scott Med J. 1998 Jun;43(3):67-9. doi: 10.1177/003693309804300301.Scott Med J. 1998.PMID: 9682288Review.No abstract available.