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We describe two ELBW infants affected by hyperkalaemia, treated with Kayexalate, who developed serious hypernatraemia, that has never been reported before in preterm infants.
 two ELBW infants affected by hyperkalaemia: Subject; two: Subject.Population; infants: Subject.Age; ELBW: Subject.Disorder; serious hypernatraemia: Effect; Kayexalate: Treatment; hyperkalaemia: Treatment.Disorder; Kayexalate: 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:
 two ELBW infants affected by hyperkalaemia: Subject; two: Subject.Population; infants: Subject.Age; ELBW: Subject.Disorder; serious hypernatraemia: Effect; Kayexalate: Treatment; hyperkalaemia: Treatment.Disorder; Kayexalate: Treatment.Drug