541
METHODS : A study cohort of 8 , 770 patients age > or = 65 years with a new diagnosis of AF was identified from a provincewide database of Quebec residents with a myocardial infarction ( MI ) between 1991 and 1999 .
 Disease: AF; Disease: myocardial infarction; Disease: MI
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; Disease: myocardial infarction; Disease: MI