1. Department of Laboratory Medicine , La Paz-Carlos III-Cantoblanco University Hospital , Madrid , Spain
2. Institute for Laboratory Medicine and Microbiology Munich Municipal Clinic Group , Munich , Germany
3. Biochemistry Department , Worcestershire Acute Hospitals NHS Trust , Worcester Royal Hospital , Worcester , UK
4. Department of Clinical Biochemistry , Cork University Hospital Group , Cork , England
5. Department of Laboratory Medicine , KU Leuven University Hospitals Leuven , Leuven , Belgium
6. Department of Medical Laboratory Diagnostics , University Hospital Sveti Duh , Zagreb , Croatia
7. Clinical Biochemistry and Pharmacology , Odense Universitetshospital , Odense , Denmark
8. Department of Laboratory Medicine , University of Washington , Seattle , WA , USA
9. Norwegian Quality Improvement of Laboratory Examinations (Noklus) , Haraldsplass Deaconess Hospital , Bergen , Norway
10. Department of Laboratory Medicine , Paracelsus Medical University Salzburg , Salzburg , Austria