1. Departments of Intensive Care and Emergency Medicine; ‘s-Hertogenbosch; The Netherlands
2. Medical Microbiology and Infection Control Jeroen Bosch Hospital; ‘s-Hertogenbosch; The Netherlands
3. Clinical Chemistry; ‘s-Hertogenbosch; The Netherlands
4. Department of Gastroenterology and Hepatology; University Medical Center Utrecht; Utrecht; The Netherlands
5. National Institute for Public Health and the Environment (RIVM); Centre for Infectious Disease Control; Bilthoven; The Netherlands