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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.
 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
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 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