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Searching for observational studies: what does citation tracking add to PubMed? A case study in depression and

Hannah Kuper1, Amanda Nicholson, Harry Hemingway

  • 1International Centre for Eye Health, Clinical Research Unit, London School of Hygiene & Tropical Medicine, London, UK. hannah.kuper@lshtm.ac.uk

BMC Medical Research Methodology
|February 18, 2006
PubMed
Abstract

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