00505nas a2200157   4500000000100000000000100001008004100002100001600043700001200059700001800071700001600089245021000105300001100315490000700326022001400333       2010                            d1 aR. Charlton1 aJ. Weil1 aM. Cunnington1 aC. de Vries00aIdentifying major congenital malformations in the UK General Practice Research Database (GPRD): a study reporting on the sensitivity and added value of photocopied medical records and free text in the GPRD  a741-500 v33  a0114-5916