992
People aged over 75 in atrial fibrillation on warfarin : the rate of major hemorrhage and stroke in more than 500 patient - years of follow - up .
 Disease: atrial fibrillation; Chemical: warfarin; Disease: hemorrhage; Disease: stroke
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: atrial fibrillation; Chemical: warfarin; Disease: hemorrhage; Disease: stroke