1. Department of Clinical Chemistry, Sestre milosrdnice University Hospital Center, Zagreb, Croatia
2. Laboratory of Medical Biochemistry, Zagreb County Health Center, Velika Gorica, Croatia
3. Clinical Department of Laboratory Diagnostics, Clinical Hospital Center Rijeka, Rijeka, Croatia
4. Department of Medical Laboratory Diagnostics, University Hospital “Sveti Duh”, Zagreb, Croatia
5. Department of Laboratory Diagnostics, University Hospital Centre Zagreb, Zagreb, Croatia
6. Department of Laboratory Medicine, Central Laboratory, University Clinic Halle, Halle (Saale), Germany
7. Laboratory of Endocrinology, Department of Oncology and Nuclear Medicine, Sestre milosrdnice University Hospital Center, Zagreb, Croatia
8. Department of Laboratory Diagnostics, General hospital Pula, Pula, Croatia