Sigmundsdottir G, Atladottir A, Hardardottir H, Gudmundsdottir E, Geirsdottir M, Briem H
Centre for Health Security and Infectious Disease Control, Directorate of Health, Reykjavik, Iceland.
Euro Surveill. 2007 Nov 1;12(11):E071101.2. doi: 10.2807/esw.12.44.03298-en.