1. Clinic for Birds Dr. Kay Pieper and Dr. Alexandra Fluck Leverkusen; Leverkusen Germany
2. Clinic for Birds, Reptiles, Amphibians and Fish; Justus-Liebig University Giessen; Giessen Germany
3. Institute of Virology, Justus-Liebig University Giessen; Giessen Germany
4. Institute of Veterinary Pathology, Justus-Liebig University Giessen; Giessen Germany