Assertion: ulcer's cause | /r/HasProperty | rare
Facets:
value: in comparison.[citation
type: OTHER
Source sentences:
text: Other causes are rare.
text: Aphthous stomatitis and local trauma are very common causes of oral ulceration; the many other possible causes are all rare in comparison.[citation needed]
text: Other causes are rare.
text: Aphthous stomatitis and local trauma are very common causes of oral ulceration; the many other possible causes are all rare in comparison.[citation needed]