Assertion: ankylosing spondylitis | /r/HasProperty | the most common condition
Facets:
value: within the spondyloarthritis family
type: OTHER
Source sentences:
text: Ankylosing spondylitis is the most common condition within a group of several rheumatic conditions called the spondyloarthropathies, which cause chronic joint problems.
text: Ankylosing spondylitis may be the most common disease you've never heard of—not to mention the true cause of your low-back pain.
text: Ankylosing spondylitis is a type of arthritis, and is the most common condition within the spondyloarthritis family, according to the American College of Rheumatology.