1. Department of Internal Medicine; Leiden University Medical Center; Leiden The Netherlands
2. Department of Internal Medicine-Hematology; Maastricht University Medical Center; Maastricht The Netherlands
3. Department of Intensive Care Medicine; Academic Medical Center; Amsterdam The Netherlands
4. Sanquin Diagnostics; Sanquin Blood Bank; Amsterdam The Netherlands
5. Center for clinical transfusion research; Sanquin Research; Leiden The Netherlands
6. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden The Netherlands
7. South West Region; Sanquin Blood Bank; Rotterdam The Netherlands