1. Institute for Experimental Virology, TWINCORE Center for Experimental and Clinical Infection Research Hannover; Germany
2. Clinic for Horses; University of Veterinary Medicine Hannover; Hannover Germany
3. Department of Biomedicine; University of Basel and Division of Gastroenterology and Hepatology, University Hospital Basel; Basel Switzerland
4. Dental Clinical Research Core; National Institute of Dental Craniofacial Research, National Institutes of Health; Bethesda MD
5. Institute of Virology, University of Veterinary Medicine Hannover; Hannover Germany
6. Department of Pathology; University of Veterinary Medicine Hannover; Hannover Germany