Affiliations

• ¹ Clinical Biochemistry, Leeds Teaching Hospitals NHS Trust Leeds General Infirmary, Leeds, UK.
• ² Centre for Metrological Traceability in Laboratory Medicine (CIRME), University of Milan, Milano, Italy.
• ³ Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA.
• ⁴ Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA.
• ⁵ HyTest Ltd, Turku, Finland.
• ⁶ Analytical Science Group, National Physical Laboratory, Teddington, UK.
• ⁷ European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel, Belgium.
• ⁸ Biochemical Science Division, National Institute of Standards and Technology, Gaithersburg, MD, USA.
• ⁹ Pathology Queensland, Department of Chemical Pathology, Royal Brisbane and Women's Hospital, Herston, Qld, Australia. Electronic address: jill_tate@health.qld.gov.au.