Assertion: kidney stone's cause | /r/HasProperty | hyperparathyroidism
Facets:
Source sentences:
text: At least 90% of kidney stones are made up of calcium and the number one cause of kidney stones is hyperparathyroidism, a disease caused by a problem with the parathyroid glands.
text: Thus, by far the most common cause for kidney stones is hyperparathyroidism--a disease of calcium caused by a tumor on one or two of the parathyroid glands.