1. Laboratory of Toxicology, Faculty of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
2. School of Veterinary Medicine, The University of Zambia, P.O. Box 32379, Lusaka, Zambia
3. Faculty of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo 060-0814, Japan
4. Research Faculty of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan
5. Water Research Group, School of Environmental Sciences and Development, NorthWest University, Potchefstroom 2520, South Africa