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The following describes a patient on a stable regimen of warfarin who developed severe hypoprothrombinemia and bleeding 4 weeks after starting gemfibrozil.
 a patient: Subject; hypoprothrombinemia and bleeding: Effect; on a stable regimen of warfarin: Treatment; 4 weeks after starting gemfibrozil: Treatment; warfarin: Treatment.Drug; gemfibrozil: Treatment.Drug; 4 weeks: Treatment.Time_elapsed
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 a patient: Subject; hypoprothrombinemia and bleeding: Effect; on a stable regimen of warfarin: Treatment; 4 weeks after starting gemfibrozil: Treatment; warfarin: Treatment.Drug; gemfibrozil: Treatment.Drug; 4 weeks: Treatment.Time_elapsed