Assertion: vitamin d | /r/HasProperty | ≤20 ng/ml
Facets:
Source sentences:
text: Two reviews of observational studies and intervention trials reached the same conclusions: When parsing the observational data, both reviews found a correlation between depression and low levels of vitamin D (≤20 ng/mL).
text: It is estimated that as much as half the world, including more than 40% of Americans, have low levels of vitamin D (≤20 ng/mL).