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Our cohort included 1739 patients with acute ischemic stroke treated with intravenous tissue plasminogen activator of whom 125 (7.2%) were receiving warfarin before admission and had an international normalized ratio <1.7.
 1739 patients: Subject; 1739: Subject.Population; intravenous tissue plasminogen activator: Treatment; intravenous: Treatment.Route; tissue plasminogen activator: Treatment.Drug
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 1739 patients: Subject; 1739: Subject.Population; intravenous tissue plasminogen activator: Treatment; intravenous: Treatment.Route; tissue plasminogen activator: Treatment.Drug