1Department of Epidemiology, Center for Public Health, Medical University of Vienna, Vienna, Austria 2Clinical Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria 3 Kuratorium for Dialysis and Transplantation (KfH), Germany 4Nephrology, Clinique Charcot, Sainte-Foy-lès-Lyon, France 5Investigation Network Initiative-Cardiovascular and Renal Clinical Trialists (INI-CRCT Network), Nancy, France Correspondence: Dr. Manfred Hecking, Medical University of Vienna, Center for Public Health, Department of Epidemiology, Kinderspitalgasse 15, 1090 Vienna, Austria. Email: [email protected] See related article, "Association of Bioimpedance Parameters with Increases in Blood Pressure during Hemodialysis," on pages 329–335.