Article,

Declaration of transparency for each research article.

, and .
BMJ (Clinical research ed.), (January 2013)7500<m:linebreak></m:linebreak>JID: 8900488; OID: NLM: PMC3737035; epublish;<m:linebreak></m:linebreak>Publicació.
DOI: 10.1136/bmj.f4796

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