Assertion: spondylolisthesis | /r/AtLocation | the base of the spine
Facets:
value: usually
type: TEMPORAL
value: generally
type: DEGREE
Source sentences:
text: Spondylolisthesis is a slipping of vertebra that occurs generally at the base of the spine.
text: According to WebMD, listhesis or spondylolisthesis is a slipping of the back bone or vertebra, usually occurring at the base of the spine.