1. Health Technology and Services Research Department, Technical Medical Centre, University of Twente, Enschede, The Netherlands.
2. Department of General Practice and Centre for Cancer Research, University of Melbourne, Melbourne, VIC, Australia.
3. Department of Health & Human Services, State Government of Victoria, Melbourne, VIC, Australia.
4. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK.
5. Department of Primary Care and Public Health, Brighton and Sussex Medical School, University of Sussex, Falmer, UK.
6. Department of General Practice, Institute of Health and Society, University of Oslo, Oslo, Norway.
7. The Norwegian Organisation for Quality Improvement of Laboratory Examinations (NOKLUS), Haraldsplass Deaconess Hospital, Bergen, Norway.
8. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.
9. Norwegian Porphyria Centre, Department of Medical Biochemistry and Pharmacology, Haukeland University Hospital, Bergen, Norway.
10. Department of Family Medicine, CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, The Netherlands.
11. Sector Zorg, Zorginstituut Nederland, Diemen, The Netherlands.
12. Laboratory for Clinical Chemistry and Haematology, Jeroen Bosch Hospital, ‘s-Hertogenbosch, The Netherlands.
13. Cancer Health Services Research, School of Population and Global Health, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Melbourne, VIC, Australia.