Associations between exemption and survival outcomes in the UK's primary care pay-for-performance programme: a retrospective cohort study
Evangelos Kontopantelis, David A Springate, Darren M Ashcroft, Jose M Valderas, Sabine N van der Veer, David Reeves, Bruce Guthrie, Tim Doran
BMJ Quality & Safety Sep 2016, 25 (9) 657-670; DOI: 10.1136/bmjqs-2015-004602