1. The Roslin Institute and The Royal (Dick) School of Veterinary Studies; University of Edinburgh; Midlothian UK
2. Department of Pathology and Veterinary Diagnostics; Faculty of Veterinary Medicine; Warsaw University of Life Sciences; Warsaw Poland
3. College of Veterinary Medicine; Agricultural University of Hebei; Baoding China
4. Department of Veterinary Diagnostic and Production Animal Medicine; College of Veterinary Medicine; Iowa State University; Ames IA USA