1. Austrian Association for Quality Assurance and Standardization of Medical and Diagnostic Tests (ÖQUASTA), Vienna, Austria
2. The Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), Haraldsplass Deaconess Hospital, Bergen, Norway
3. Danish Institute for External Quality Assurance for Laboratories in the Health Sector (DEKS), Rigshospitalet-Glostrup, Glostrup, Denmark
4. Royal College of Pathologists of Australasia Quality Assurance Programs (RCPAQAP), St Leonards, NSW, Australia