1. Department of Medical Laboratory Diagnostics , Clinical Hospital “Sveti Duh” , Zagreb , Croatia
2. Department of Nursing , Umeå University , Umeå , Sweden
3. Department of Laboratory Medicine , Paracelsus Medical University , Salzburg , Austria
4. BD Life Sciences – Preanalytical Systems , Reading , UK
5. Department of Clinical Biochemistry , Worcester Acute Hospitals NHS Trust , Worcester , UK
6. Department of Clinical Chemistry , Academic Medical Center , Amsterdam , The Netherlands
7. Ümraniye Research and Training Hospital , Istanbul , Turkey
8. Clinic for Otorhinolaryngology and Maxillofacial Surgery, Clinical Center of Serbia , Belgrade , Serbia
9. Department of Medical Biosciences , Clinical Chemistry, Umeå University , Umeå , Sweden
10. Department of Clinical Pathology , São João Hospital Center, Department of Biomedicine, Faculty of Medicine , Porto , Portugal ; and EPI Unit, Institute of Public Health , University of Porto , Porto , Portugal
11. National Association of Phlebotomists , London , UK
12. Department of Clinical Laboratory , University Hospital Arnau de Vilanova , Lleida , Spain .
13. Greiner Bio-One GmbH , Kremsmuenster , Austria
14. Clinical Laboratory Diagnostic and Pathomorphology Department , Autonomous non-profit organization of additional professional education “Institute of Laboratory Medicine” , Moscow , Russia
15. Norwegian quality improvement of laboratory examinations , Bergen , Norway
16. Section of Clinical Biochemistry, University of Verona , Verona , Italy ; and Latin American Working Group for Preanalytical Phase (WG-PRE-LATAM) of the Latin America Confederation of Clinical Biochemistry (COLABIOCLI) , Verona , Italy
17. Section of Clinical Chemistry , University of Verona , Verona , Italy
18. Institute of Laboratory Medicine, Kliniken Nordoberpfalz AG and Klinikum St. Marien , Weiden and Amberg , Germany
19. Clinical Biochemistry and Pharmacology , Odense University Hospital , Odense , Denmark
20. West Hertfordshire Hospitals NHS Trust, Operating UK NEQAS for Haematology and Transfusion , Watford , UK
21. Sarstedt GmbH & Co.KG , Nümbrecht , Germany
22. Center for Medical Biochemistry, Clinical Center of Serbia , Belgrade , Serbia
23. Department of Laboratory Medicine , University of Leuven , Leuven , Belgium