00362nas a2200145   4500000000100000000000100001008004100002100001200043700001600055700001200071245010100083300001100184490000700195022001400202       2010                            d1 aN. Khan1 aS. Harrison1 aP. Rose00aValidity of diagnostic coding within the General Practice Research Database: a systematic review  a128-360 v60  a0960-1643