1. Faculty of Medicine University of Iceland Reykjavik Iceland
2. Department of Gastroenterology and Hepatology Landspitali University Hospital Reykjavik Iceland
3. Department of Medicine Sahlgrenska University Hospital Gothenburg Sweden
4. DeCODE Genetics Reykjavik Iceland
5. Primary Health Care of the Capital Area Reykjavik Iceland
6. Department of Laboratory Hematology and Coagulation Center Landspitali University Hospital Reykjavik Iceland
7. Department of Otolaryngology – Head and Neck Surgery Landspitali University Hospital Reykjavik Iceland