Assertion: viagra's sildenafil | /r/HasAspect | narrowing of the aortic valve
Facets:
Source sentences:
text: Sildenafils have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failure
text: Sildenafils have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failure