1. Clinic for Swine at the Centre for Clinical Veterinary Medicine, Ludwig Maximilian University of Munich; Oberschleissheim Germany
2. Veterinary practise Bueren; Bueren Germany
3. Institute for Anatomy, Histology and Embryology, Ludwig Maximilian University of Munich; Munich Germany
4. Institute for Infectious Diseases and Zoonosis, Ludwig Maximilian University of Munich; Munich Germany