Assertion: filter | /r/AtLocation | the ivc
Facets:
value: for less than three weeks
type: TEMPORAL
Source sentences:
text: Prior to 2004, filters that had been in the IVC for less than three weeks were considered suitable to attempt retrieval, as filters that have been in place longer might have been overgrown by cells from the IVC wall and there was an increased risk of IVC injury if the filter is dislodged.