1. Governmental Institute of Public Health of Lower Saxony (NLGA); Hannover Germany
2. Postgraduate Training for Applied Epidemiology (PAE); Robert Koch Institute (RKI); Berlin; Germany in association with the European Programme for Intervention Epidemiology Training (EPIET); European Centre for Disease Prevention and Control (ECDC); Stockholm Sweden
3. Local Public Health Department; Oldenburg Germany
4. National Reference Centre for Hepatitis B and D; Institute for Medical Virology; Justus Liebig University; Giessen Germany