title: Opponent's comments.
authors.affiliation: CNR-IFC (National Research Council of Italy and Pisa Institute of Clinical Physiology, Reggio Cal Unit), Reggio Calabria, Italy.
authors.forename: Carmine
authors.initials: C
authors.lastname: Zoccali
authors.affiliation: Department of Pharmacology, Georges Pompidou European Hospital, National Institute of Health and Medical Research U970, Paris, France.
authors.forename: Gerard
authors.initials: G
authors.lastname: London