1 Division of Nephrology, 2nd Department of Internal Medicine, Attikon University Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece.
2 Department of Nephrology, Democritus University of Thrace, School of Health Sciences, Alexandroupoli, Greece.
3 Clinic of Nephrology and Renal Transplantation, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece.
4 Department of Nephrology, General Hospital G. Gennimatas, Athens, Greece.
5 Department of Nephrology, University of Ioannina, Faculty of Medicine, University Hospital of Ioannina, Loannina, Greece.
6 2nd Department of Nephrology, AHEPA University Hospital, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece.
7 4th Department of Internal Medicine, Attikon University General Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
8 Department of Nephrology and Renal Transplantation, University Hospital of Patras, Patras, Greece.
9 Department of Rheumatology, Faculty of Medicine, University Hospital of Ioannina, Loannina, Greece.
10 Department of Nephrology, National and Kapodistrian University of Athens School of Medicine, Aretaieio Hospital, Athens, Greece.
11 Department of Nephrology, University of Crete, School of Medicine, Heraklion, Greece.