1. Institute for Novel and Emerging Infectious Diseases, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut, Isle of Riems, Germany.
2. Max Planck Institute for Evolutionary Biology, Plön, Germany.
3. Department of Veterinary Medicine, Small Animal Clinic, Freie Universität Berlin, Berlin, Germany.
4. Institute of Avian Research, “Vogelwarte Helgoland,” Island Station, Helgoland, Germany.
5. Institute for Epidemiology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut, Wusterhausen, Germany.
6. Institute for Biochemistry and Biology of the University of Postdam, Potsdam, Germany.
7. Clinical Virology, Department of Pathobiology, University of Veterinary Medicine, Vienna, Austria.
8. Centre for Biological Safety 1, Robert Koch-Institut, Berlin, Germany.