1. Small Animal Teaching Hospital, Department of Veterinary Clinical Sciences, University of Liverpool, Chester High Road, Neston, Wirral CH64 7TE, UK
2. Royal Canin Research Center, Aimargues, France
3. Waltham Centre for Pet Nutrition, Freeby Lane, Waltham-on-the-Wolds, Melton Mowbray, LE14 4RT, UK