Assertion: tea's level | /r/HasProperty | 8.03 to 53.3 ng/g dry leaves
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text: Researchers from NCI (National Cancer Institutes) and Brazil found both cold- and hot-water extractions of popular commercial yerba-maté products contained high levels (8.03 to 53.3 ng/g dry leaves) of carcinogenic polycyclic aromatic hydrocarbons (PAHs) (i.e. benzo[a]pyrene).