[1] Concord Hosp, Dept Rheumatol, Sydney, NSW, Australia
[2] Univ Sydney, Sydney Sch Publ Hlth, Sydney, NSW, Australia
[3] Childrens Hosp Westmead, Ctr Kidney Res, Sydney, NSW, Australia
[4] Canberra Hosp, Dept Rheumatol, Canberra, ACT, Australia
[5] Liverpool Hosp, Dept Rheumatol, Sydney, NSW, Australia