Assertion: atrial fibrillation | /r/CapableOf | occur over long period of time
Facets:
Source sentences:
text: In addition, atrial fibrillation that occurs over a long period of time can significantly weaken the heart and lead to heart failure.
text: In addition, atrial fibrillation that occurs over a long period of time and that is not well treated can significantly weaken the heart and lead to heart failure.