1564
However, in 1993, a clinical study involving 400 patients on the Thai-Burmese border revealed cardiac effects of antimalarial treatment with halofantrine, including one sudden death after the treatment.
 ( adverse event: effects ,  400 patients on the Thai-Burmese border: Subject, 400: Subject.Population, cardiac effects: Effect, sudden death: Effect, halofantrine: Treatment, halofantrine: Treatment.Drug, antimalarial treatment: Treatment.Drug, halofantrine: Combination.Drug, antimalarial treatment: 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:
 ( adverse event: effects ,  400 patients on the Thai-Burmese border: Subject, 400: Subject.Population, cardiac effects: Effect, sudden death: Effect, halofantrine: Treatment, halofantrine: Treatment.Drug, antimalarial treatment: Treatment.Drug, halofantrine: Combination.Drug, antimalarial treatment: Combination.Drug) 