1. Environmental Biology Laboratory, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
2. Department of Basic Medical Sciences, National Institute for Minamata Disease, Minamata, Japan
3. Laboratory of Health Chemistry, Showa Pharmaceutical University, Tokyo, Japan
4. Department of Environmental Health Sciences and Molecular Toxicology, Tohoku University Graduate School of Medicine, Sendai, Japan
5. Department of Medical Biochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan