| Authors: |
Hansen CH; Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Artillerivej 5, 2300 Kbh S, Denmark; MRC International Statistics and Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK. Electronic address: choh@ssi.dk., Moustsen-Helms IR; Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Artillerivej 5, 2300 Kbh S, Denmark., Rasmussen M; Virus Research and Development Laboratory, Virus & Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark., Søborg B; Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Artillerivej 5, 2300 Kbh S, Denmark., Ullum H; Division of Infectious Disease Preparedness, Statens Serum Institut, Copenhagen, Denmark., Valentiner-Branth P; Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Artillerivej 5, 2300 Kbh S, Denmark. |