1. Laboratory of Toxicology; Department of Environmental Veterinary Sciences; Graduate School of Veterinary Medicine; Hokkaido University; Kita-ku Sapporo Japan
2. Water Research Group; Unit for Environmental Sciences and Management; North-West University; Potchefstroom South Africa
3. Department of Environmental Veterinary Sciences; Graduate School of Veterinary Medicine; Hokkaido University; Kita-ku Sapporo Japan
4. Food Control Department; Faculty of Veterinary Medicine; Zagazig University; Zagazig Egypt
5. Diagnostic Center for Animal Health and Food Safety; Obihiro University of Agriculture and Veterinary Medicine; Obihiro Japan