1. Laboratory of Toxicology, Department of Environmental Veterinary Sciences, School of Veterinary Medicine, Hokkaido University, Kita18, Nishi9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
2. Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman Street, Potchefstroom, 2531, South Africa
3. Graduate School of Science, Hokkaido University, Kita10, Nishi8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
4. Institute for Raptor Biomedicine Japan, 2-2101 Hokuto, Kushiro-shi, Hokkaido 084-0922, Japan
5. National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan