title: Opponent's comments.
authors.affiliation: Department of Nephrology, University of Queensland at Princess Alexandra Hospital, Level 2, ARTS Building, Ipswich Road, Woolloongabba, Brisbane, QLD 4102, Australia.
authors.forename: David W
authors.initials: DW
authors.lastname: Mudge
authors.affiliation: University of Sydney, Sydney, NSW, Australia.
authors.forename: Angela C
authors.initials: AC
authors.lastname: Webster
authors.affiliation: Department of Nephrology, University of Queensland at Princess Alexandra Hospital, Level 2, ARTS Building, Ipswich Road, Woolloongabba, Brisbane, QLD 4102, Australia.
authors.forename: David W
authors.initials: DW
authors.lastname: Johnson