Validation and validity of diagnoses in the General Practice Research Database: a systematic review.

Herrett, E; Thomas, SL; Schoonen, WM; Smeeth, L; Hall, AJ; (2010) Validation and validity of diagnoses in the General Practice Research Database: a systematic review. British journal of clinical pharmacology, 69 (1). pp. 4-14. ISSN 0306-5251 DOI: https://doi.org/10.1111/j.1365-2125.2009.03537.x

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