1. Department of Clinical Veterinary Medicine; University of Bristol, Langford House; Langford Bristol BS40 5DU
2. Research Center for Proper Housing: Poultry and Rabbits (ZTHZ), Division of Animal Welfare, VPH Institute; University of Bern; 3052 Zollikofen Switzerland
3. Animal Health Trust, Lanwades Park; Kentford, Newmarket; Suffolk CB8 7UU