Comparison of the Concentrations of Polychlorinated Dibenzo-p-dioxins, Polychlorinated Dibenzofurans, and Polychlorinated Biphenyls in the Blood of Yusho Patients Measured in 2004 with those Measured in 2014 (油症とPCB及びダイオキシン関連化合物に関する研究報告集(第27集))