1. Department of Intensive Care Medicine; VU University Medical Center; Amsterdam The Netherlands
2. Department of Intensive Care Medicine; University Medical Center Utrecht; Utrecht The Netherlands
3. Department of Intensive Care; VU University Medical Center; Amsterdam The Netherlands
4. Department of Intensive Care; Medisch Spectrum Twente; Enschede The Netherlands
5. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam The Netherlands
6. Department of Clinical Chemistry and Haematology; University Medical Center Utrecht; Utrecht The Netherlands