Assertion: bse's incubation period | /r/HasProperty | several years
Facets:
value: often
type: TEMPORAL
Source sentences:
text: The incubation period of BSE is more than a year and often several years.
text: The incubation period of BSE is more than a year and often several years.
text: The incubation period in humans has not been established, but appears to be at least several years.