Table 1.

Research questions. Overview of the clinical research questions

	Query name
Q1	How many endarterectomies are performed in 1, 2 and 3 vessel diseased patients
Q2	What is the mean age of patients who underwent only venous revascularization
Q3	What is the number of patients older than 65 years only arterial revascularised as a percentage of the total number of patients.
Q4	Male/Female ratio
Q5	What is the number of complications per operation location.
Q6	What is the number of patients with left main- and 3 vessel disease
Q7	What is the percentage of patients in each hospital with diabetes (Erasmus MC, MCRZ).
Q8	What is the average amount of distal anastomoses per operation.
Q9	What is the number of 1, 2 and 3 vessel diseased patients in Erasmus MC and MCRZ.