1 Rheumatology Department, Royal North Shore Hospital, Northern Clinical School, Faculty of Medicine and Health, The University of Sydney and Institute of Bone and Joint Research, Kolling Institute of Medical Research, The University of Sydney, Sydney, NSW 2065, Australia; Clinical Research Centre, Zhujiang Hospital, Southern Medical University, Guangzhou, China. Electronic address: david.hunter@sydney.edu.au.
2 Rheumatology Department, Royal North Shore Hospital, Northern Clinical School, Faculty of Medicine and Health, The University of Sydney and Institute of Bone and Joint Research, Kolling Institute of Medical Research, The University of Sydney, Sydney, NSW 2065, Australia.