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BMJ. 2004 Jul 3;329(7456):34-8.
Gunnell D, Ashby D.
Department of Social Medicine, University of Bristol, Bristol BS8 2PR. d.j.gunnell@bristol.ac.uk
Comment in:
PMID: 15231620 [PubMed - indexed for MEDLINE]PMCID: PMC443451Free PMC Article
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