1. Department of Food Sciences, Laboratory of Food Analysis, Faculty of Veterinary Medicine, University of Liège, Liège 4000, Belgium
2. Department of Pathobiology, Pharmacology and Zoological Medicine, Laboratory of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Ghent University, Merelbeke 9820, Belgium
3. Department of Animal Science, Chuka University, P.O. Box 109, 00625 Chuka, Kenya
4. Department of Biology, Faculty of Science and Technology, University of Nairobi, P.O. Box 30197, 00100 Nairobi, Kenya
5. Department of Clinical Chemistry, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, University Hospital of Liège, Liège 4000, Belgium
6. Consultant, P.O. Box 34405, 00100 Nairobi, Kenya
7. DSM - BIOMIN Research Center, Tulln 3430, Austria
8. Department of Veterinary Pathology, Microbiology, and Parasitology, Faculty of Veterinary Medicine, University of Nairobi, P.O. Box 29053, 00100 Nairobi, Kenya
9. International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
10. Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala SE-751 05, Sweden
11. Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala SE-750 07, Sweden
12. Chair Poultry Health Sciences, Faculty of Veterinary Medicine, Ghent University, Merelbeke 9820, Belgium