Julia Hippisley-Cox, Shaun O'Hanlon, Carol Coupland
Hippisley-Cox J, O'Hanlon S, Coupland C.
Association of deprivation, ethnicity, and sex with quality indicators for diabetes: population based survey of 53 000 patients in primary care
BMJ 2004; 329 :1267
doi:10.1136/bmj.329.7477.1267