1. Department of Nephrology, University Medical Center, Utrecht, The Netherlands
2. Department of Nephrology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
3. Department of Renal Medicine, Karolinska University Hospital, Stockholm, Sweden
4. Department of Nephrology, University Campania ‘Luigi Vanvitelli’, Naples, Italy
5. Internal Medicine IV, Renal and Hypertensive Disease, University Medical Center, Homburg/Saar, Germany
6. Department of Nephrology, Dialysis, Nutrition, Centre Hospitalier Lyon Sud, Pierre Bénite Cedex, France
7. Department of Nephrology and Renal Transplantation, Patras University Hospital, Greece
8. Nephrologische Klinik Klinikum Coburg, Coburg, Germany
9. Department of Nephrology, Dialysis therapy and Internal Medicine, Warsaw Medical University, Warsaw, Poland
10. Division of Nephrology, Ambroise Paré Hospital, Paris Ile de France West University (UVSQ), Villejuif, France
11. 1st Department of Internal Medicine, Third Faculty of Medicine, Charles University, Prague, Czech Republic
12. Department of Nephrology, Medical Faculty, University of Skopje, Skopje, Former Yugoslav Republic of Macedonia
13. CNR-IFC, c/o Ospedali Riuniti, Reggio Calabria, Italy