<style face="normal" font="default" size="100%">Validation and validity of diagnoses in the General Practice Research Database: a systematic review</style>

Drupal-Bibcite

31<style face="normal" font="default" size="100%">Validation and validity of diagnoses in the General Practice Research Database: a systematic review</style><style face="normal" font="default" size="100%">Validation and validity of diagnoses in the General Practice Research Database: a systematic review</style>