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We retrospectively reviewed the records of 7 pediatric oncology patients who received low-dose ketamine in conjunction with propofol for total intravenous anesthesia (TIVA) repeatedly for radiation therapy.
 7 pediatric oncology patients: Subject; 7: Subject.Population; pediatric: Subject.Age; low-dose ketamine in conjunction with propofol for total intravenous anesthesia (TIVA) repeatedly for radiation therapy: Treatment; propofol: Treatment.Drug; ketamine: Treatment.Drug; low-dose: Treatment.Dosage; oncology: Treatment.Disorder; propofol: Combination.Drug; ketamine: Combination.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: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 7 pediatric oncology patients: Subject; 7: Subject.Population; pediatric: Subject.Age; low-dose ketamine in conjunction with propofol for total intravenous anesthesia (TIVA) repeatedly for radiation therapy: Treatment; propofol: Treatment.Drug; ketamine: Treatment.Drug; low-dose: Treatment.Dosage; oncology: Treatment.Disorder; propofol: Combination.Drug; ketamine: Combination.Drug