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Syncope and QT prolongation among patients treated with methadone for heroin dependence in the city of Copenhagen .
 Disease: Syncope; Disease: QT prolongation; Chemical: methadone; Chemical: heroin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: Syncope; Disease: QT prolongation; Chemical: methadone; Chemical: heroin