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Extent of publication bias in different categories of research cohorts: a meta-analysis of empirical studies

Fujian Song*, Sheetal Parekh-Bhurke, Lee Hooper, Yoon K Loke, Jon J Ryder, Alex J Sutton, Caroline B Hing and Ian Harvey

BMC Medical Research Methodology 2009, 9:79 doi:10.1186/1471-2288-9-79

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