Assertion: fistula | /r/CapableOf | get closed within 30–60 days
Facets:
value: spontaneously
type: TEMPORAL
value: during surveillance
type: TEMPORAL
Source sentences:
text: During surveillance some fistulas get spontaneously closed within 30–60 days  which explains to some the further asymptomatic period in the presence of a permeable biliary tract , while others still remain active 90 days after initial treatment .