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Berger A, Smith R.Berger A, et al. Among authors: smith r.BMJ. 1998 Apr 25;316(7140):1260. doi: 10.1136/bmj.316.7140.1260.BMJ. 1998.PMID: 9554894Free PMC article.No abstract available.
Hussain A, Smith R.Hussain A, et al. Among authors: smith r.BMJ. 2001 Aug 4;323(7307):263-4. doi: 10.1136/bmj.323.7307.263.BMJ. 2001.PMID: 11485955Free PMC article.No abstract available.
Docherty M, Smith R.Docherty M, et al. Among authors: smith r.BMJ. 1999 May 8;318(7193):1224-5. doi: 10.1136/bmj.318.7193.1224.BMJ. 1999.PMID: 10231230Free PMC article.No abstract available.