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PLoS clinical trials.
Academic Search Premier Available from 02/01/2006 until 06/30/2007. Available online
Academic Search PremierGale Academic OneFile Available from 07/01/2006 until 07/31/2006. Available online
Gale Academic OneFilePubMed Central Available from 2006 volume: 1 issue: 1 until 2007 volume: 2 issue: 6. Available online
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