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Hann M, Bower P, Campbell S, Marshall M, Reeves D.Hann M, et al. Among authors: campbell s.Fam Pract. 2007 Sep;24(4):323-9. doi: 10.1093/fampra/cmm020. Epub 2007 Jun 24.Fam Pract. 2007.PMID: 17591607
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Campbell S, Roland M, Wilkin D.Campbell S, et al.BMJ. 2001 Jun 30;322(7302):1580-2. doi: 10.1136/bmj.322.7302.1580.BMJ. 2001.PMID: 11431301Free PMC article.No abstract available.
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