Assertion: lithium | /r/ObjectUse | used for more than 50 years
Facets:
Source sentences:
text: It has been used for more than 50 years, and it is known to be a very effective medicine.
text: Lithium has been used for more than 50 years, so doctors and many patients are familiar with it.
text: Lithium has been used for more than 50 years, so doctors and many patients are familiar with it.