Melanie Calvert, Aparna Shankar, Richard J McManus, Helen Lester, Nick Freemantle
Calvert M, Shankar A, McManus R J, Lester H, Freemantle N.
Effect of the quality and outcomes framework on diabetes care in the United Kingdom: retrospective cohort study
BMJ 2009; 338 :b1870
doi:10.1136/bmj.b1870