Ferguson Neil M, Fraser Christophe, Donnelly Christl A, Ghani Azra C, Anderson Roy M
Department of Infectious Disease Epidemiology, Faculty of Medicine, Imperial College London, St. Mary's campus, Norfolk Place, London W2 1PG, UK.
Science. 2004 May 14;304(5673):968-9. doi: 10.1126/science.1096898.