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

Kuper, Hannah; Nicholson, Amanda; Hemingway, Harry; (2006) Searching for observational studies: what does citation tracking add to PubMed? A case study in depression and coronary heart disease. BMC medical research methodology, 6 (1). 4-. ISSN 1471-2288 DOI: https://doi.org/10.1186/1471-2288-6-4

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