Assertion: kidney stone | /r/HasProperty | sporadic
Facets:
Source sentences:
text: The reasons for the paucity of work have not been investigated but may relate to the facts that kidney stones are sporadic; that the associated pain and discomfort are transient; that recurrence rates in individuals may be high but episodes of renal colic may be separated by years; by a perception, right or wrong, that the pharmaceutical industry is not likely to find substantial profit in stone prevention.