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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.
 ( potential therapeutic event: received ,  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) 
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:
 ( potential therapeutic event: received ,  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) 