1. Department of Zoology, Faculty of Science, Tanta University, Tanta 31527, Egypt;
2. Research Centre for Toxic Compounds in the Environment, Masaryk University, Brno A29 625 00, Czech Republic;
3. Toxicology Centre, University of Saskatchewan, Saskatoon S7N 5B3, Canada;
4. Institute of Public Health, Heidelberg University, Ruperto Carola, Heidelberg D-69120, Germany