00453nas a2200169   4500000000100000000000100001008004100002100001300043700001500056700001300071700001300084700001300097245012300110300001100233490000700244022003200251       2007                            d1 aK. Wurst1 aS. Ephross1 aJ. Loehr1 aD. Clark1 aH. Guess00aThe utility of the general practice research database to examine selected congenital heart defects: a validation study  a867-770 v16  a1053-8569 (Print) 1053-8569