1. Department of Hematology; VU University Medical Center; Amsterdam the Netherlands
2. Department of Internal medicine; Northwest Clinics; Alkmaar the Netherlands
3. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam the Netherlands
4. Department of Clinical Psychology; University of Amsterdam; Amsterdam the Netherlands
5. Department of Internal Medicine; Isala; Zwolle the Netherlands
6. Department of Clinical Psychology; VU University Medical Center; Amsterdam the Netherlands