1. Arthritis Research UK Centre for Epidemiology, Manchester Academic Health Science Centre, The University of Manchester; UK
2. Division of Clinical Epidemiology; McGill University Health Centre; Canada
3. Department of Epidemiology, Biostatistics, and Occupational Health; McGill University; Canada
4. Centre of Endocrinology and Diabetes, Institute of Human Development, Manchester Academic Health Science Centre; The University of Manchester; UK
5. National Data Bank for Rheumatic Diseases; Wichita KS USA
6. University of Nebraska Medical Center; Omaha NE USA