1. Institute of Virology, Clinic for Zoo and Pet Animals, School of Veterinary Medicine, University of Zürich, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland
2. Institute of Veterinary Pathology, Clinic for Zoo and Pet Animals, School of Veterinary Medicine, University of Zürich, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland
3. Institute of Veterinary Reproduction, Clinic for Zoo and Pet Animals, School of Veterinary Medicine, University of Zürich, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland
4. Professor Emeritus, Former Director of the Basel Zoo, Mattweid 22, CH-6204 Sempach, Switzerland