1. Department of Physiology and Biochemistry, Faculty of Biosciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
2. Institute of Nutrition, Faculty of Veterinary Medicine, Free University of Berlin, Brümmerstr. 34, D-14159 Berlin, Germany
3. Federal Institute for Risk Assessment, Diedersdorfer Weg 1, D-12277 Berlin, Germany