Assertion: goiter's cause | /r/HasProperty | unclear
Facets:
value: usually
type: DEGREE
Source sentences:
text: The exact cause is unclear; however, it is believed to involve a combination of genetic and environmental factors.
text: The exact cause is unclear; however, it is believed to involve a combination of genetic and environmental factors.
text: The cause at these times is usually unclear.
text: The cause at these times is usually unclear.