Balzer 1998.

Methods	Monocentric, different surgeons Randomisation: blocks of 50 changing the operative method on a monthly term Sample size: 300 for each group Recruitment period: 1 year Mean follow up: 24 months Lost to follow up: 22 (3.9%); 9 in Dacron patch group and 13 in eversion CEA
Participants	564 patients (34% female) Mean age 66 years No patients randomised twice
Interventions	Two groups Control: Dacron patch CEA Treatment: 286 eversion CEA and 278 Dacron patch CEA
Outcomes	Perioperative (in hospital) death Perioperative (in hospital) stroke Recurrent carotid stenosis Late stroke Late death Perioperative local complications: neck hematoma
Notes	Exclusions: repeated CEA, bilateral CEA
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear