“…A decline in PFOS serum concentrations over the last decade has been observed in other countries, including Germany (Schröter-Kermani et al, 2013), the U.S. (Olsen et al, 2012), Norway (Haug et al, 2009) and Sweden (Glynn et al, 2012). Further, a decrease in exposure to PFOA has been observed, although such a decrease is, on average, less marked with respect to PFOS (Glynn et al, 2012).…”