Assertion: leech's use | /r/HasSubevent | a leech shortage
Facets:
value: from 1825
type: TEMPORAL
value: in france
type: LOCATION
Source sentences:
text: The 19th century heralded the widespread use of leeches for bloodletting—leading to a leech shortage from 1825 to 1850 in France requiring the importation of leeches from America.1, 2, 3, 4, 5, 6