1. Department of Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
2. Department of Rheumatology, Comprehensive Orthopaedic Global, Saint Thomas, VI, USA
3. Department of Rheumatology, Westmead Hospital, Westmead, NSW, USA
4. Department of Rheumatology, Great Western Hospital Wiltshire, Swindon, UK
5. Division of Rheumatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA