Assertion: tinnitus's source | /r/HasProperty | external
Facets:
Source sentences:
text: Tinnitus is the perception of noises in the head and/or ear which have no external source.
text: Tinnitus is the perception of sound that has no external source.
text: More specifically, tinnitus is the perception of sound in the ear when there is no external source present.
text: Tinnitus is the perception of noises in the head and/or ear which have no external source.