1. Royal GD, Deventer, the Netherlands
2. Department of Population Health, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
3. Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA, USA
4. Centro de Investigación y Estudios Avanzados en Salud Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, Toluca, México
5. Deltamune, Unit 34, Oxford Business Park, Centurion, South Africa
6. Klinik für Geflügel, University of Veterinary Medicine, Hannover, Germany
7. Tierarztpraxis MMT, Kothen, Germany