1. European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
2. European Programme for Public Health Microbiology (EUPHEM), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
3. Statens Serum Institut, Copenhagen, Denmark
4. National Institute of Health, Rome, Italy
5. International Center for Infectiology Research (CIRI), INSERM, Lyon, France
6. Radboud University Medical Centre, Nijmegen, the Netherlands
7. University Medical Centre Utrecht, Utrecht, the Netherlands