1. Center for Infectious Disease Control, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
2. Center for Translational Immunology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
3. AstraZeneca, 2594 AV Den Haag, The Netherlands
4. DICA (Dutch Institute for Clinical Auditing), 2333 AA Leiden, The Netherlands
5. Deventer Ziekenhuis, 7416 SE Deventer, The Netherlands
6. MSD Animal Health, 5830 AA Boxmeer, The Netherlands
7. Virology & Immunology Research, Department Medical Microbiology and Infection Prevention, University Medical Center Groningen, 9700 RB Groningen, The Netherlands