Assertion: ankylosing spondylitis's type | /r/CapableOf | affect nearly half a million people
Facets:
value: in the united states
type: LOCATION
Source sentences:
text: Like most aspects of ankylosing spondylitis, an inflammatory type of arthritis that affects nearly half a million people in the United States, according to the Arthritis Foundation, the prognosis is complicated and can be hard to predict.