1. Anses/Unit of Epidemiology and Welfare in Poultry and Rabbit farming, BP 53 Ploufragan, 22440 France
2. Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield AL9 7TA Hertfordshire, United Kingdom
3. Petersime NV Entrumstraat 125 9870 Zulte (Olsene), Belgium
4. Division M3-BIORES, KU Leuven, Kasteelpark Arenberg 30 - box 2456, 3001 Heverlee, Belgium