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A retrospective epidemiological study of deaths from hepatic angiosarcoma (HAS) in the U.S. showed that during 1964--74 there were 168 such cases, of which 37 (22%) were associated with previously known causes (vinyl chloride, 'Thorotrast', and inorganic arsenic) and 4 (3.1%) of the remaining 131 cases with the use of androgenic-anabolic steroids.
 ( adverse event: associated ,  37 (22%): Subject, 37: Subject.Population, hepatic angiosarcoma: Effect, vinyl chloride, 'Thorotrast', and inorganic arsenic: Treatment, vinyl chloride: Treatment.Drug, Thorotrast: Treatment.Drug, inorganic arsenic: Treatment.Drug, vinyl chloride: Combination.Drug, Thorotrast: Combination.Drug, inorganic arsenic: Combination.Drug) 
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:
 ( adverse event: associated ,  37 (22%): Subject, 37: Subject.Population, hepatic angiosarcoma: Effect, vinyl chloride, 'Thorotrast', and inorganic arsenic: Treatment, vinyl chloride: Treatment.Drug, Thorotrast: Treatment.Drug, inorganic arsenic: Treatment.Drug, vinyl chloride: Combination.Drug, Thorotrast: Combination.Drug, inorganic arsenic: Combination.Drug) 