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Flowchart of enrollment procedures for the study. A total of 2483 cases were registered during the study period and 1351 patients were recruited into piracetam treatment group and control group after the exclusion of those receiving intravenous thrombolytic agent within 3 h of symptoms onset (n = 49), those having incomplete or erroneous admission or discharge NIHSS score (n = 953) and those having transient ischemia stroke (n = 130). NIHSS, National Institute of Health Stroke Scale.
