1. Department of Virology, Statens Serum Institut, Copenhagen, Denmark.
2. The Bandim Health Project, Bissau, Guinea-Bissau.
3. Centro de Tratamento Ambulatório (CTA), Hospital Nacional Simão Mendes (HNSM), Bissau, Guinea-Bissau.
4. Department of Infectious Diseases, University Hospital Copenhagen, Copenhagen, Denmark.
5. Vaccine Research and Development, Statens Serum Institut, Copenhagen, Denmark.
6. Infectious Disease Research Unit, Clinical Institute, University of Southern Denmark, Odense, Denmark.