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BioMed Central is committed to providing free access to original research papers. For this reason, all the research papers published in any BioMed Central journal are free for anyone to view, download, and further disseminate in full text or PDF format. Access to the value-added content (such as review articles, commentary articles, web reports, image databases and evaluation services) is not free, and this is the content for which we make a subscription charge.

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