Fig. 1

Human serum concentrations of PFOA and PFOS in Japan and several other countries collected from 2000 to 2005. The data for Tsukuba, Yokohama, and other sites in Japan are taken from Taniyasu et al. [20] and Harada et al. [18, 50]. The data are geometric means and geometric standard errors in Japan. For the USA and Sweden, the data are geometric means reported by Olsen et al. [19] and Kärrman et al. [52], respectively. For Germany, the data are medians reported by Fromme et al. [51]