Journal Article
                        
                        Thjodleifsson, Bjarni, Hulda  Asbjörnsdottir, Rúna B Sigurjonsdottir, David  Gislason, Isleifur  Olafsson, Elizabet  Cook, Thorarinn  Gíslason, Rain  Jogi, and Christer  Janson.  
"Seroprevalence of Helicobacter pylori and cagA antibodies in Iceland, Estonia and Sweden." Scandinavian Journal of Infectious Diseases 39, no. 8 (2009): 683-689.