Assertion: ankylosing spondylitis | /r/HasAspect | known specific cause
Facets:
value: unfortunately
type: OTHER
Source sentences:
text: Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved.
text: Unfortunately, ankylosing spondylitis has no known specific causes, although research continues to determine what sparks the disease.
text: Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved.
text: Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved.