4213
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 .
 cardiac effects, halofantrine; sudden death, halofantrine
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 cardiac effects, halofantrine; sudden death, halofantrine