1. Swedish Reference Laboratory for Pathogenic Neisseria, Department of Laboratory Medicine, Microbiology, Örebro University Hospital, Örebro, Sweden
2. Department of Microbiology, Oslo University Hospital, Ullevål, Oslo, Norway
3. Division of Infectious Disease Control, Norwegian Institute of Public Health, Oslo, Norway
4. Olafiaklinikken, Oslo University Hospital, Oslo, Norway
5. Faculty of Medicine, University of Oslo, Oslo, Norway