1. Department of Infectious Diseases Leiden University Medical Center Leiden The Netherlands
2. Department of Internal Medicine Alrijne Hospital Leiderdorp The Netherlands
3. Department of Internal Medicine Haga Teaching Hospital Den Haag The Netherlands
4. Department of Medical Microbiology Alrijne Hospital Leiderdorp The Netherlands
5. Department of Medical Microbiology Leiden University Medical Center Leiden The Netherlands
6. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands