1. Department of Clinical Chemistry and
2. European Reference Laboratory, Location Queen Beatrix Hospital, Winterswijk, the Netherlands
3. Norfolk and Norwich University Hospital, Norwich, UK
4. Laboratory of Pediatric Biology and Research, University Hospital of Reims, Reims, France
5. School of Medicine, University of Nottingham, Royal Derby Hospital Site, Derby, UK
6. Peking University People's Hospital, Beijing, China
7. Department of Clinical Chemistry, Isala Clinics, Zwolle, the Netherlands
8. European Reference Laboratory, Location Isala, Zwolle, the Netherlands
9. Departments of Pathology and Child Health, University of Missouri School of Medicine, Columbia, MO
10. Department of Management of Noncommunicable Diseases, World Health Organization, Geneva, Switzerland
11. Department of Laboratory Medicine, NIH, Bethesda, MD
12. Diabetes and Endocrine Department, Ichikawa General Hospital, Ichikawa, Japan