1. Pathology Division; Department of Pathobiology; Utrecht University; Yalelaan 8 3584 CM Utrecht The Netherlands
2. Institute of Animal Nutrition; School of Veterinary Medicine Hannover; Bischofsholer Damm 15 D-30173 Hannover Germany
3. Department of Internal Medicine, Erasmus MC; University Medical Centre Rotterdam; Dr Molewaterplein 40 3015 GD Rotterdam The Netherlands
4. Department of Clinical Sciences of Companion Animals; Faculty of Veterinary Medicine; Utrecht University; Yalelaan 8 3584 CM Utrecht The Netherlands