1. Institute of Animal Nutrition, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
2. Small Animal Clinic, Faculty of Veterinary Medicine, Justus-Liebig-University Giessen, Giessen, Germany
3. Department of Agriculture, Hellenic Mediterranean University, Heraklion, Greece
4. Department of Geography, Harokopio University, Athens, Greece
5. Department of Animal Science, Laboratory of Nutritional Physiology and Feeding, School of Animal Biosciences, Agricultural University of Athens, Athens, Greece