1. Clinical Laboratory Research Division, Laboratory Medicine, University of Debrecen, Medical and Health Science Center, 4032 Debrecen, Hungary
2. Central Laboratory, Gróf Tisza Hospital, 4100 Berettyóújfalu, Hungary
3. Central Pharmacy, Szent Borbála Hospital, 2800 Tatabánya, Hungary
4. Department of Internal Medicine, Erzsébet Hospital, 3980 Sátoraljaújhely, Hungary
5. Department of Neurology, Erzsébet Hospital, 3980 Sátoraljaújhely, Hungary
6. Department of Internal Medicine, University of Debrecen, 4032 Debrecen, Hungary
7. Department of Nephrology, University of Debrecen, 4032 Debrecen, Hungary
8. Dialysis Center, Erzsébet Hospital, 3980 Sátoraljaújhely, Hungary
9. LabPharm Kft, 3980 Sátoraljaújhely, Hungary
10. Integrated Central Laboratory, Szent Borbála Hospital, 2800 Tatabánya, Hungary