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Among patients receiving aspirin and clopidogrel, prophylactic use of a PPI reduced the rate of upper gastrointestinal bleeding.
 patients receiving aspirin and clopidogrel: Subject; reduced the rate of upper gastrointestinal bleeding: Effect; PPI: Treatment; aspirin: Treatment.Drug; clopidogrel: Treatment.Drug; PPI: Treatment.Drug; aspirin: Combination.Drug; clopidogrel: Combination.Drug; PPI: Combination.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:
 patients receiving aspirin and clopidogrel: Subject; reduced the rate of upper gastrointestinal bleeding: Effect; PPI: Treatment; aspirin: Treatment.Drug; clopidogrel: Treatment.Drug; PPI: Treatment.Drug; aspirin: Combination.Drug; clopidogrel: Combination.Drug; PPI: Combination.Drug