1. National Influenza Center, Department of Virology, Erasmus Medical Center, Rotterdam, The Netherlands
2. ViroClinics BV, Rotterdam, The Netherlands
3. Department of Zoology, University of Cambridge, Cambridge, United Kingdom
4. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico
5. Division of Virology, Istituto Superiore di Sanità, Rome, Italy
6. Istituto Zooprofilattico Sperimentale, Parma, Italy
7. Laboratory of Virology, Faculty of Veterinary Medicine, Ghent University, Ghent, Belgium