Level and temporal trend of perfluoroalkyl acids in Greenlandic Inuit.

EPA and European regulations, and of ceased production of PFOS-based products from the world's formerly largest producer (3M), human serum levels of PFOS and PFOA have shown a decreasing trend in studies from the United States and Norway ( 10 , 16 , 17 ).

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However, an increasing trend has been reported in studies from Japan and China ( 18 , 19 ).

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