1. College of Health Sciences Arsi University Asella Ethiopia
2. Hirsch Institute of Tropical Medicine Asella Ethiopia
3. Department of Gastroenterology, Hepatology and Infectious Diseases University Hospital Duesseldorf Medical Faculty Heinrich Heine University Duesseldorf Germany
4. Internal Medicine III – Gastroenterology and Infectious Diseases University Hospital of Augsburg Augsburg Germany
5. Institute of Virology University Hospital Duesseldorf Medical Faculty Heinrich Heine University Duesseldorf Duesseldorf Germany
6. Institute of Virology University of Cologne Cologne Germany
7. Adama Hospital Medical College Adama Oromia Ethiopia