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CASE REPORT: A six-year-old boy with transfusion-dependent beta-thalassaemia developed a unilateral hearing loss shortly after commencing desferrioxamine therapy.
 ( adverse event: developed ,  A six-year-old boy with transfusion-dependent beta-thalassaemia: Subject, six-year-old: Subject.Age, boy: Subject.Gender, a unilateral hearing loss: Effect, commencing desferrioxamine therapy: Treatment, transfusion-dependent beta-thalassaemia: Treatment.Disorder, shortly after: Treatment.Time_elapsed, desferrioxamine: Treatment.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: developed ,  A six-year-old boy with transfusion-dependent beta-thalassaemia: Subject, six-year-old: Subject.Age, boy: Subject.Gender, a unilateral hearing loss: Effect, commencing desferrioxamine therapy: Treatment, transfusion-dependent beta-thalassaemia: Treatment.Disorder, shortly after: Treatment.Time_elapsed, desferrioxamine: Treatment.Drug) 