1. Department of Chemical Pathology, SydPath , St Vincent’s Hospital , Darlinghurst , NSW , Australia
2. Faculty of Medicine , University of NSW , Kensington , NSW , Australia
3. School of Public Health , The University of Sydney , C amperdown , NSW , Australia
4. Clinical Laboratory , Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico , Milano , Italy
5. Department of Laboratory Medicine , National University Hospital , Singapore , Singapore
6. School of Medicine , University of Notre Dame , Darlinghurst , NSW , Australia
7. NHMRC Clinical Trials Centre , The University of Sydney , Camperdown , NSW , Australia
8. Norwegian Organization for Quality Improvement of Laboratory Examinations (NOKLUS), Haraldsplass Deaconess Hospital , Bergen , Norway
9. Norwegian Porphyria Centre, Department of Medical Biochemistry and Pharmacology , Haukeland University Hospital , Bergen , Norway
10. Institute of Public Health and Primary Health Care , University of Bergen , Bergen , Norway
11. Test Evaluation Group, Academic Unit of Health Economics , University of Leeds , Leeds , UK
12. NIHR Leeds In Vitro Diagnostic (IVD) Co-Operative , Leeds , UK
13. Department of Chemical Pathology , New South Wales Health Pathology, Prince of Wales Hospital , Randwick , Australia