1. The Pirbright Institute, Woking, United Kingdom
2. The Francis Crick Institute, London, United Kingdom
3. Department of Pathology, University of Cambridge, Addenbrookes Hospital, Cambridge, United Kingdom
4. Lewis Thomas Laboratory, Department of Molecular Biology, Princeton University, Princeton, New Jersey, USA
5. Department of Virology, Norwegian Institute of Public Health, Oslo, Norway
6. Department of Breeding and Genetics, Nofima, Ås, Norway