1. University Hospital Southampton NHS Foundation Trust; Department of Rheumatology; Southampton UK
2. University of British Columbia; Division of Rheumatology; 1650 Terminal Ave, Suite 206 Nanaimo BC Canada V9S 0A3
3. Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology, Cabrini Hospital; Suite 41, Cabrini Medical Centre 183 Wattletree Road Malvern Victoria Australia 3144
4. Institute for Work & Health; 481 University Avenue, Suite 800 Toronto ON Canada M5G 2E9