The Carotid Stenting Trialists ' Collaboration is a pooled individual patient database including all patients recruited in 3 randomized trials of stenting versus endarterectomy for symptomatic carotid stenosis ( Endarterectomy Versus Angioplasty in patients with Symptomatic Severe Carotid Stenosis trial , Stent-Protected Angioplasty versus Carotid Endarterectomy trial , and International Carotid Stenting Study ) .