Drug-Related Side Effects and Adverse ReactionsIschemic Attack, TransientStrokeCerebrovascular DisordersBrain IschemiaCarotid StenosisCarotid Artery DiseasesEndarterectomy, CarotidTime FactorsRisk FactorsRecurrenceFollow-Up StudiesCerebral InfarctionProspective StudiesEndarterectomyTreatment OutcomeIntracranial ArteriosclerosisCerebral Angiography