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Meta-analysis of aggregated data: effect of carotid endarterectomy in patients with asymptomatic carotid stenosis (MACE: Mayo asymptomatic carotid endarterectomy trial; VA: Veterans Administration trial; ACAS: Asymptomatic carotid atherosclerosis study; L’AURC: Etude multicentique prospective randomisée comparant traitment médical et chirurgical des stenoses serrées atheromateuses asymptomatiques des carotides)
