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In these experiments , verapamil shortened mean effective refractory period ( ERP ) from 122 + / - 5 to 114 + / - 4 ms ( P < 0 . 02 ) at a cycle length of 300 ms , decreased ERP heterogeneity ( from 15 + / - 1 to 10 + / - 1 % , P < 0 . 05 ) , heterogeneously accelerated atrial conduction and decreased the cycle length of AF ( 94 + / - 4 to 84 + / - 3 ms , P < 0 . 005 ) .
 Chemical: verapamil; Disease: AF
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: verapamil; Disease: AF