All AJ. Validation and validity of diagnoses in the General Practice Research Database: a systematic review. Br J Clin Pharmacol. 2010;69(1):4?4. doi:10.1111/j.1365-2125.2009.03537.x.that can feed back into more targeted studies, both basic science and epidemiological.ConclusionsThis study has found that GC use is associated with an increased risk of death in RA, both all-cause and causespecific m