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As a library, NLM provides access to scientific literature. Inclusion in an NLM database does not imply endorsement of, or agreement with, the contents by NLM or the National Institutes of Health.
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. 1991 Sep;106(3).

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This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use and redistribution provided that the original author and source are credited.

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PMCID: PMC5115131

Articles from West of England Medical Journal are provided here courtesy of Bristol Medico Chirurgical Society

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