1. Bone and Mineral Research Unit, Instituto Reina Sofía de Investigación, REDinREN del ISCIII, Hospital Universitario Central de Asturias, Universidad de Oviedo, Oviedo, Asturias, Spain
2. Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, NH, USA
3. Facultad de Ciencias de la Educación, Universidad Autónoma de Chile, Santiago, Chile
4. Department of Nephrology and Clinical Immunology, RWTH Aachen University, Aachen, Germany
5. Division of Nephrology, Klinikum Coburg, Coburg, Germany
6. Centre Hospitalier FH, Manhes, France
7. Department of Nephrology, Dialysis and Renal Transplant, Alessandro Manzoni Hospital, Lecco, Italy
8. Department of Nephrology, Hospital Clinico Universitario, Valencia, Spain
9. Department of Medicine, Health Research Institute INCLIVA, University of Valencia, Valencia, Spain
10. Department of Nephrology, Transplantology and Internal Medicine, Gdańsk Medical University, Gdańsk, Poland
11. Department of Internal Medicine, St Antonius Hospital, Nieuwegein, The Netherlands
12. Department of Nephrology, UZ Brussel, Brussels, Belgium
13. Nephrology Division, Geneva University Hospital, Geneva, Switzerland
14. Division of Nephrology, University Hospital, Zürich, Switzerland
15. Department of Nephrology and Dialysis, Sestre Milosrdnice University Hospital, Zagreb, Croatia
16. Department of Nephrology, University Medical Centre, Ljubljana, Slovenia
17. Department of Medicine, Universidad de Alcalá Nephrology Section and Research Unit Foundation, Hospital Universitario Príncipe de Asturias, Alcalá de Henares, Spain IRSIN REDinREN (Instituto de Salud Carlos III), Madrid, Spain
18. Divisions of Renal Medicine and Baxter Novum (CLINTEC), Karolinska Institutet, Sweden
19. CNR National Research Council (Italy), Clinical Epidemiology and Physiopathology of Renal Disease and Hypertension and Renal and Transplantation Unit, Ospedali Riuniti, Italy