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BACKGROUND : Atrial tachycardia - induced remodeling promotes the occurrence and maintenance of atrial fibrillation ( AF ) and decreases L - type Ca ( 2 + ) current .
 Disease: Atrial tachycardia; Disease: atrial fibrillation; Disease: AF; Chemical: Ca
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: Atrial tachycardia, atrial fibrillation, AF, Ca 
Answer:
 Disease: Atrial tachycardia; Disease: atrial fibrillation; Disease: AF; Chemical: Ca