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METHODS : To evaluate the potential mechanisms of AF promotion by Ca ( 2 + ) channel blockers , we administered verapamil to morphine - chloralose anesthetized dogs .
 Disease: AF; Chemical: Ca; Chemical: verapamil; Chemical: morphine; Chemical: chloralose
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: AF; Chemical: Ca; Chemical: verapamil; Chemical: morphine; Chemical: chloralose