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Full text available at:
DOAJ Directory of Open Access Journals
Available from 2011.
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Hindawi Publishing Open Access Journals
Available from 06/09/2011 volume: 2011.
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Publicly Available Content Database
Available from 01/01/2012.
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PubMed Central
Available from 2011 volume: 2011.
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PubMed Central Open Access
Available from 2011 volume: 2011.