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Effects of the search technique on the measurement of the change in quality of randomized controlled trials over time in the field of brain injury.
Borsody MK, Yamada C
BMC Med Res Methodol 2005 Feb 7, 5:7
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Searching for observational studies: what does citation tracking add to PubMed? A case study in depression and coronary heart disease
Kuper H, Nicholson A, Hemingway H
BMC Medical Research Methodology 2006, 6:4 (16 February 2006)
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