1. IRCCS Istituto Ortopedico Galeazzi, Laboratory of Experimental Biochemistry & Molecular Biology , 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. Vita-Salute San Raffaele University , Milan , Italy
5. Laboratory Medicine, IRCCS San Raffaele Scientific Institute , Milan , Italy
6. School of Medicine, Acibadem Mehmet Ali Aydınlar University , Istanbul , Turkey
7. Hospital Universitario La Paz , Madrid , Spain
8. Quality Analytical Commission of Spanish Society of Clinical Chemistry (SEQC) , Barcelona , Spain
9. Department of Global Public Health and Primary Care , University of Bergen , Bergen , Norway
10. Clinical Laboratory, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico , Milan , Italy