1. Department of Medical Laboratory Diagnostics, University Hospital Sveti Duh, Zagreb, Croatia
2. Department of Medical Biochemistry Laboratory, General Hospital Varaždin, Varaždin, Croatia
3. Croatian Society of Medical Biochemistry and Laboratory Medicine (CROQALM), Zagreb, Croatia
4. Medical Biochemistry Laboratory, Primary Health Care Centre Zagreb - East, Zagreb, Croatia
5. Department for Clinical Laboratory Diagnostics, University Hospital Centre Osijek, Osijek, Croatia
6. Laboratory of Endocrinology, Department of Oncology and Nuclear Medicine, Sestre Milosrdnice University Hospital Center, Zagreb, Croatia
7. University Department of Chemistry, Sestre Milosrdnice University Hospital Center, Zagreb, Croatia
8. Central Laboratory, University Hospital Halle, Halle (Saale), Germany
9. Medical Biochemistry Laboratory, Synlab Hrvatska-Polyclinic for Medical Laboratory Diagnostics, Zagreb, Croatia
10. Department of Laboratory Diagnostics, General Hospital Dr. Josip Benčević, Slavonski Brod, Croatia
11. Department of Medical Laboratory Diagnostics, University Hospital of Split, Split, Croatia
12. Department of Nuclear Medicine and Radiation Protection, University Hospital Centre Zagreb, Zagreb, Croatia
13. Medical Biochemistry Laboratory, Special Hospital AGRAM, Zagreb, Croatia