Gillesberg Lassen S, Soborg B, Midgley S E, Steens A, Vold L, Stene-Johansen K, Rimhanen-Finne R, Kontio M, Löfdahl M, Sundqvist L, Edelstein M, Jensen T, Vestergaard H T, Fischer T K, Mølbak K, Ethelberg S
Department of Infectious Disease Epidemiology, Statens Serum Institut, Copenhagen, Denmark.
Euro Surveill. 2013 Apr 25;18(17):20467.