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OBJECTIVES : The aim of this study was to determine whether the use of amiodarone in patients with atrial fibrillation ( AF ) increases the risk of bradyarrhythmia requiring a permanent pacemaker .
 Chemical: amiodarone; Disease: atrial fibrillation; Disease: AF; Disease: bradyarrhythmia
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:
 Chemical: amiodarone; Disease: atrial fibrillation; Disease: AF; Disease: bradyarrhythmia