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53-year-old woman with a history of deep vein thrombosis and pulmonary embolism was receiving warfarin to prevent thromboembolic complications; her international normalized ratio (INR) had been stable for 1 month.
 ( potential therapeutic event: prevent ,  53-year-old woman with a history of deep vein thrombosis and pulmonary embolism: Subject, 53-year-old: Subject.Age, woman: Subject.Gender, warfarin: Treatment, warfarin: Treatment.Drug, deep vein thrombosis: Treatment.Disorder, pulmonary embolism: Treatment.Disorder, thromboembolic complications;: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( potential therapeutic event: prevent ,  53-year-old woman with a history of deep vein thrombosis and pulmonary embolism: Subject, 53-year-old: Subject.Age, woman: Subject.Gender, warfarin: Treatment, warfarin: Treatment.Drug, deep vein thrombosis: Treatment.Disorder, pulmonary embolism: Treatment.Disorder, thromboembolic complications;: Treatment.Disorder) 