Assertion: pericardial valve | /r/ObjectUse | used in patients of all ages
Facets:
value: during the 1970s
type: TEMPORAL
value: during 80s
type: TEMPORAL
Source sentences:
text: During the 1970s and 80s, Shiley pericardial valves had been used in patients of all ages, and particularly in patients under the age of 65 years.