Assertion: neurofibromatosis's symptom | /r/CapableOf | develop over many years
Facets:
value: gradually
type: MANNER
Source sentences:
text: Symptoms of neurofibromatosis type 1 NF1 is a condition you're born with, although some symptoms develop gradually over many years.
text: People are born with the condition, although symptoms can develop gradually over a number of years.