1. Laboratory Medicine, IRCCS San Raffaele Scientific Institute , Milan , Italy
2. Department of Medical Biochemistry and Pharmacology , Haukeland University Hospital , Bergen , Norway
3. Norwegian Organization for Quality Improvement of Laboratory Examinations (Noklus), Haraldsplass Deaconess Hospital , Bergen , Norway
4. School of Medicine, University of Dundee , Scotland , UK
5. Acibadem Mehmet Ali Aydınlar University, School of Medicine , Istanbul , Turkey
6. Hospital Universitario La Paz, and Quality Analytical Commission of Spanish Society of Laboratory Medicine (SEQC ) , Madrid , Spain
7. Certe-Wilhelmina Ziekenhuis Assen, Europaweg-Zuid 1 , Assen , The Netherlands
8. Department of Laboratory Medicine , University Hospital of Padova , Padova , Italy
9. Department of Global Public Health and Primary Care , University of Bergen , Bergen , Norway
10. Central Laboratory, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico , Milan , Italy