Assertion: sentinel surveillance | /r/HasProperty | conducted in selected locations
Facets:
Source sentences:
text: Because sentinel surveillance is conducted only in selected locations, however, it may not be as effective for detecting rare diseases or diseases that occur outside the catchment areas of the sentinel sites.
text: Because sentinel surveillance is conducted only at selected locations, it is not as appropriate for use on rare diseases or outbreaks distant from sentinel sites.
text: Because sentinel surveillance is conducted only in selected locations, however, it may not be effective for detecting rare diseases or diseases that occur outside the catchment areas of the sentinel sites.