by Nada F Khan, Sian E Harrison, and Peter W Rose Validity of diagnostic coding within the General Practice Research Database: a systematic review by Nada F Khan, Sian E Harrison, and Peter W Rose BJGP Volume 60(572):e128-e136 March 1, 2010 ©2010 by British Journal of General Practice
Flowchart of literature search results. Nada F Khan et al. Br J Gen Pract 2010;60:e128-e136 ©2010 by British Journal of General Practice
Forest plot reporting positive predictive values of diagnoses in the General Practice Research Database. Forest plot reporting positive predictive values of diagnoses in the General Practice Research Database. Nada F Khan et al. Br J Gen Pract 2010;60:e128-e136 ©2010 by British Journal of General Practice