1. Agricultural Research Service, U.S. Department of Agriculture, U.S. National Poultry Research Center, Athens, GA, USA
2. College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
3. Unitat mixta d’Investigació IRTA-UAB en Sanitat Animal, Centre de Recerca en Sanitat Animal (CReSA), Bellaterra, Spain
4. IRTA. Programa de Sanitat Animal, Centre de Recerca en Sanitat Animal (CReSA), Bellaterra, Spain
5. College of Veterinary Medicine, Konkuk University, Seoul, Republic of Korea
6. Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA