1. European Centre for Disease Prevention and Control Stockholm Sweden
2. Laboratório de Nutrição Faculdade de Medicina Clínica Universitária de Gastrenterologia Universidade de Lisboa Lisboa Portugal
3. Department of Gastroenterology, HPB and Transplant Surgery Military Medical Academy Sofia Bulgaria
4. Department of Infectious Diseases Akershus University Hospital Lørenskog Norway
5. Department of Medicine Haukeland University Hospital Bergen Norway
6. Early Detection, Prevention and Infections Branch, International Agency for Research on Cancer Lyon France
7. World Health Organization Regional Office for Europe Copenhagen Denmark
8. Liver Unit Hospital General Universitario Vall d'Hebron and CIBEREHD del Instituto Carlos III. Barcelona España