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When publishing observational research, what information should journals make available to the medical community before a result can be considered sufficiently reliable to inform patient care or health policy? The PLOS Medicine editors, in recent consultation with our editorial board, endorse measures in four areas to advance transparency in the analysis and reporting of observational studies.
http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1001711