1Internal Medicine III, Nephrology and Dialysis, Medical University of Vienna, Vienna, Austria
2Department of Transplantation Medicine, Nephrology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
3Faculty of Clinical Medicine, University of Oslo, Oslo, Norway
4Department of Internal Medicine I, Cardiology and Nephrology, Krankenhaus der Barmherzigen Brüder Eisenstadt, Eisenstadt, Austria
5Internal Medicine III, Endocrinology and Metabolism, Medical University of Vienna, Vienna, Austria
6Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, Vienna, Austria
71st Medical Department, Hanusch Hospital, Vienna, Austria
8CNR Institute of Neuroscience, Padova, Italy
9Medizinische Klinik m. S. Nephrologie, Charité Universitätsmedizin Berlin, Berlin, Germany
10Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
11Department of Nephrology, Hospital del Mar-Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Barcelona, Spain
12Metabolic and Renal Research Group, Faculty of Health Sciences, UiT- The Arctic University of Norway, Tromsø, Norway
⁎Corresponding author. Internal Medicine III, Nephrology and Dialysis, Medical University of Vienna, Vienna, Austria. manfred.hecking@meduniwien.ac.at