1. Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Padilla, 323, Barcelona, España
2. SEQCML, Analytical Quality Commission, Barcelona, España
3. EFLM, Task Group on Biological Variation Database, Madrid, España
4. EFLM, Working Group on Biological Variation, Madrid, España
5. Hospital Universitario La Paz, Madrid, España
6. Quality Healthcare, Grupo ACMS, Madrid, España
7. EFLM, Task Group on Biological Variation Database, Vilafranca del Penedes, España
8. Consortium of Laboratory Intercomarcal Alt Penedès and Garraf l’Anoia, Vilafranca del Penedes, España
9. Hospital Royo Villanova, Zaragoza, España
10. EFLM, Task Group on Biological Variation Database, Salamanca, España
11. Hospital Universitario de Salamanca, Salamanca, España
12. EFLM, TaskGroup on Biological Variation Database, Badalona, España
13. Hospital Germans Trias i Pujol, Badalona, España
14. EFLM, Task Group on Biological Variation Database, Barcelona, España
15. Hospital Vall d’Hebron, Barcelona, España
16. Hospital Universitario San Agustin, Aviles, España
17. EFLM, Task Group on Biological Variation Database, Bergen, Norway
18. EFLM, Working Group on Biological Variation, Bergen, Norway
19. Haukeland University Hospital, Bergen, Norway
20. Norwegian Quality Improvement of Laboratory Examinations, Haraldplass Deaconess Hospital, Bergen, Norway
21. EFLM, Task Group on Biological Variation Database, Toronto, Canada
22. Institute for Quality Management in Healthcare of Canada, Toronto, Canada
23. EFLM, Task Group on Biological Variation Database, Milan, Italy
24. EFLM, Working Group on Biological Variation, Milan, Italy
25. Laboratory Medicine, Ospedale San Raffaele, Milan, Italy
26. EFLM, Task Group on Biological Variation Database, Istanbul, Turkey
27. EFLM, Working Group on Biological Variation, Istanbul, Turkey
28. Acibadem Universitesi, Istanbul, Turkey
29. Department of Global Public Health, Bergen, Norway