1. European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control, Stockholm, Sweden
2. Department of Epidemiology, Statens Serum Institut, Copenhagen, Denmark
3. Department of Clinical Microbiology, Hillerød Hospital, Hillerød, Denmark
4. Department of Bacteriology, Mycology and Parasitology, Statens Serum Institut, Copenhagen, Denmark