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Mean time between initiation of gemcitabine therapy and onset of HUS was 7.4 +/- 3.5 months, or 21.9 +/- 10.9 doses of gemcitabine.
 ( adverse event: onset ,  HUS: Effect, 7.4 +/- 3.5 months, or 21.9 +/- 10.9 doses of gemcitabine: Treatment, gemcitabine: Treatment.Drug, 7.4 +/- 3.5 months: Treatment.Time_elapsed, 21.9 +/- 10.9 doses: Treatment.Dosage) 
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: onset ,  HUS: Effect, 7.4 +/- 3.5 months, or 21.9 +/- 10.9 doses of gemcitabine: Treatment, gemcitabine: Treatment.Drug, 7.4 +/- 3.5 months: Treatment.Time_elapsed, 21.9 +/- 10.9 doses: Treatment.Dosage) 