title: Author reply.
authors.affiliation: Department of Rheumatology, The University of Melbourne at St Vincent's Hospital, Melbourne, Victoria, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Nikpour
authors.affiliation: Department of Cardiology, St Vincent's Hospital, Melbourne, Victoria, Australia.
authors.forename: D
authors.initials: D
authors.lastname: Prior
authors.affiliation: Department of Rheumatology, The University of Adelaide at Royal Adelaide Hospital, Adelaide, South Australia, Australia.
authors.forename: S
authors.initials: S
authors.lastname: Proudman
authors.affiliation: Department of Rheumatology, St Vincent's Hospital, Melbourne, Victoria, Australia.
authors.forename: W
authors.initials: W
authors.lastname: Stevens