1. Department of Medical Decision Making; Leiden University Medical Center; Leiden the Netherlands
2. Department of Medical Psychology; Leiden University Medical Center; Leiden the Netherlands
3. Department of Anesthesiology; Albert Schweitzer Hospital; Dordrecht the Netherlands
4. Jon J van Rood, Netherlands Center for Clinical Transfusion Research; Sanquin Research; Leiden the Netherlands
5. Department of Orthopaedics; Leiden University Medical Center; Leiden the Netherlands