International Circumpolar Surveillance System for invasive pneumococcal disease, 1999-2005.
Bruce MG, Deeks SL, Zulz T, Bruden D, Navarro C, Lovgren M, Jette L, Kristinsson K, Sigmundsdottir G, Jensen KB, et al. Emerg Infect Dis. 2008 Jan; 14(1):25-33.