title: Opponent's comments.
authors.affiliation: Fundació Puigvert, Department of Nephrology, IIB Sant Pau, RedinRen, Barcelona, Catalonia, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Bover
authors.affiliation: Department of Nephrology and Renal Transplantation, University Hospitals, Leuven, Belgium.
authors.forename: Pieter
authors.initials: P
authors.lastname: Evenepoel
authors.affiliation: Department of Nephrology and Dialysis, Clinique du Landy, Saint-Ouen, France Department of Renal Physiology, Necker Hospital, University of Paris Descartes, Paris, France.
authors.forename: Pablo
authors.initials: P
authors.lastname: Ureña-Torres
authors.affiliation: Department of Nephrology and Institute for Cardiovascular Research VU (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: Marc G
authors.initials: MG
authors.lastname: Vervloet
authors.affiliation: Department of Cardiology and Intensive Care Medicine, RWTH University Hospital Aachen, Aachen, Germany.
authors.forename: Vincent
authors.initials: V
authors.lastname: Brandenburg
authors.affiliation: Department of Cardiovascular, Respiratory, Nephrologic and Geriatric Sciences, Sapienza University of Rome, Rome, Italy.
authors.forename: Sandro
authors.initials: S
authors.lastname: Mazzaferro
authors.affiliation: Clinic of Nephrology, C.I. Parhon University Hospital, Gr. T. Popa, University of Medicine and Pharmacy, Iasi, Romania.
authors.forename: Adrian
authors.initials: A
authors.lastname: Covic
authors.affiliation: King's Health Partners AHSC London, London, UK.
authors.forename: David
authors.initials: D
authors.lastname: Goldsmith
authors.affiliation: Division of Nephrology, Ambroise Paré Hospital, Paris Ile de France Ouest University, Paris, France INSERM U1088, Picardie University Jules Verne, Amiens, France.
authors.forename: Ziad A
authors.initials: ZA
authors.lastname: Massy
authors.affiliation: Department of Health Sciences, Renal Division and Laboratory of Experimental Nephrology, San Paolo Hospital, University of Milan, Milan, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Cozzolino