[1] Univ Otago Wellington, Dept Med, Wellington, New Zealand
[2] Hutt Valley Dist Hlth Board, Wellington, New Zealand
[3] UCL, Ctr Rheumatol, London, England
[4] UCL, Dept Neuromuscular Dis, London, England
[5] Univ Coll London Hosp NHS Fdn Trust, Dept Rheumatol, London, England
[6] London North West Univ Healthcare NHS Trust, Dept Rheumatol, Northwick Pk Hosp, London, England
[7] Univ Queensland, Sch Clin Med, Herston, Qld, Australia
[8] Royal Brisbane & Womens Hosp, Metro North Hosp & Hlth Serv, Herston, Qld, Australia