00470nas a2200193   4500000000100000000000100001008004100002100001400043700001700057700001800074700001200092700001500104700001400119700001400133245009700147300001100244490000700255022001400262       2014                            d1 aR. Mathur1 aK. Bhaskaran1 aN. Chaturvedi1 aD. Leon1 aT. vanStaa1 aE. Grundy1 aL. Smeeth00aCompleteness and usability of ethnicity data in UK-based primary care and hospital databases  a684-920 v36  a1741-3842