Assertion: rheumatoid arthritis's pain | /r/CapableOf | affect muscle
Facets:
value: of back
type: LOCATION
value: of the extremities
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: Although patients with FMS experience significant musculoskeletal pain, the pain is generally widespread and diffuse and often affects the muscles, especially of the extremities and back.