1. Department of Clinical Biochemistry, Ashford & St. Peter’s Hospitals NHS Trust, Chertsey, UK
2. Department of Chemical Pathology, Beaumont Hospital, Dublin, Ireland
3. University of Cambridge, Metabolic Research Laboratories, Addenbrooke’s Hospital, Cambridge, UK
4. Department of Clinical Biochemistry, Addenbrooke’s Hospital, Cambridge, UK
5. Department of Endocrinology and Diabetes Beaumont Hospital, Dublin, Ireland
6. Department of Endocrinology and Metabolism, University of Pisa, Pisa, Italy
7. Department of Medical Biochemistry, University Hospital of Wales, Cardiff, UK
8. Department of Chemical Endocrinology, Radboud University Nijmegen, Nijmegen, the Netherlands