1. The Pirbright Institute & UK-China Centre of Excellence for Research on Avian Diseases, Pirbright, Guildford, Surrey, United Kingdom
2. School of Animal Science and Technology, Guangxi University, Nanning, China
3. Binzhou Animal Science and Veterinary Medicine Academy & UK-China Centre of Excellence for Research on Avian Diseases, Binzhou, China
4. Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
5. College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
6. The Roslin Institute, R(D)SVS, University of Edinburgh, Midlothian, United Kingdom
7. The Jenner Institute Laboratories, University of Oxford, Oxford, United Kingdom
8. Department of Zoology, University of Oxford, Oxford, United Kingdom