1. Virus Research and Development Laboratory, Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark
2. Department of Infectious Disease Immunology, Vaccine Adjuvant Research, Statens Serum Institut, Copenhagen, Denmark
3. Nature Technology Corporation, Lincoln, NE, USA
4. Infectious Disease Research Unit, Clinical Institute, University of Southern Denmark, Odense, Denmark