Assertion: ankylosing spondylitis | /r/HasProperty | characterized by pain
Facets:
Source sentences:
text: Ankylosing Spondylitis (AS) is a chronic inflammatory disease characterized by pain and progressive stiffness.
text: AS is also known as von Bechterew’s disease, Marie-Strümpell disease, and rheumatoid spondylitis, and it is characterized by spinal stiffness and pain.
text: It is characterized by stiffness and pain from the lower back to the neck.