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We report on a 14-year-old boy with severe haemophilia A who developed a portal vein thrombosis during continuous infusion of F VIII.
 ( adverse event: developed ,  a 14-year-old boy with severe haemophilia A: Subject, 14-year-old: Subject.Age, boy: Subject.Gender, a portal vein thrombosis: Effect, continuous infusion of F VIII: Treatment, continuous: Treatment.Freq, infusion: Treatment.Route, F VIII: Treatment.Drug, haemophilia A: 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:
 ( adverse event: developed ,  a 14-year-old boy with severe haemophilia A: Subject, 14-year-old: Subject.Age, boy: Subject.Gender, a portal vein thrombosis: Effect, continuous infusion of F VIII: Treatment, continuous: Treatment.Freq, infusion: Treatment.Route, F VIII: Treatment.Drug, haemophilia A: Treatment.Disorder) 