1. Equine Clinic: Surgery and Radiology, Freie Universitaet Berlin, 14163 Berlin, Germany
2. Institute for Veterinary Epidemiology and Biostatistics, Freie Universitaet Berlin, 14163 Berlin, Germany
3. Chair of Bacteriology and Mycology, Department of Veterinary Sciences, Faculty of Veterinary Medicine, Institute for Infectious Diseases and Zoonosis, Ludwig-Maximilians-Universität, 85764 Oberschleißheim, Germany