Austrian Association for Quality Assurance and Standardization of Medical and Diagnostic Tests (ÖQUASTA), University Hospitals Birmingham NHS Foundation Trust, UK National External Quality Assessment Scheme (UK NEQAS) for Haematology, Centre Toulousain pour le Contrôle de qualité en Biologie clinique (CTCB), Royal College of Pathologists of Australasia Quality Assurance Program, Independent, Paracelsus Medical University Salzburg - Salzburger Landeskrankenhaus, Laboratoire National de Métrologie et d’Essais (LNE), Medical University of Vienna - Vienna General Hospital, Reference Institute for Bioanalytics, The Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), Medical University of Innsbruck - University Hospital of Innsbruck, ESEAP – Proficiency Testing Scheme for Clinical Laboratories, Royal College of Pathologists of Australasia Quality Assurance Program, LGC, Ltd., ESEAP – Proficiency Testing Scheme for Clinical Laboratories, Careggi University Hospital of Florence, The Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), Columbia University - New York Presbyterian, The Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), INSTAND e.V. Society for Promoting Quality Assurance in Medical Laboratories, Radboud University - Radboud University Medical Center, University of British Columbia (UBC) - Department of Pathology and Laboratory Medicine and University of British Columbia (UBC) - Department of Pathology and Laboratory Medicine