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.
 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
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:
 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