1. Nepean Hospital, Kingswood, NSW 2747, Australia
2. Sydney Musculoskeletal Health, Kolling Institute, Faculty of Medicine and Health, The University of Sydney, St Leonards, NSW 2065, Australia
3. Rheumatology Department, Royal North Shore Hospital, St Leonards, NSW 2065, Australia
4. Senior Lecturer in Clinical Medicine & Consultant Rheumatologist, University Medical Unit, National Hospital Sri Lanka, Colombo 00700, Sri Lanka
5. Faculty of Medicine, University of Colombo, Colombo 00800, Sri Lanka