Sobolev 2012.

Methods	Cohort study
Participants	Patients needing elective coronary artery bypass grafting (CABG)
Interventions	Intervention: supplementary funding to tertiary care hospitals providing cardiac surgical care Control: no additional funding for cardiac surgery
Outcomes	Time between decision to operate and surgical revascularisation
Notes	Could be considered inappropriate interrupted time series (ITS) study ‐ study authors to be contacted for additional data