1. Boehringer Ingelheim Veterinary Research Center, Hannover, Germany
2. Boehringer Ingelheim Vetmedica, Inc., Ames, IA, USA
3. OIE/FAO and National Reference Laboratory for Newcastle Disease and Avian Influenza, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell'Università, Legnaro, Italy
4. Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany
5. Boehringer Ingelheim Vetmedica, S.A. de C.V, Guadalajara, Mexico
6. Centre de Recerca en Sanitat Animal, CReSA, UAB-IRTA, Barcelona, Spain
7. National Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Giza, Egypt