One odd result so far - a search for BNP (a peptide not the dark side of UKIP) in heart failure worked well, but when the 'diagnosis' filter was applied the results became less relevant to the use of BNP as a diagnostic tool. It's difficult to get get metadata right on search engines (Berry Brothers does a very good job, but that is because of the nature of their business). Maybe not even worth it. Just let users put in the words they want and let the technology de-fangle the query.
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