1. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada;
2. Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Canada;
3. Centre for Prognosis Studies in Rheumatic Diseases, Krembil Research Institute, Toronto Western Hospital, University Health Network, Toronto, Canada;
4. Department of Clinical Biochemistry, University Health Network, Toronto, Canada;
5. Division of Rheumatology, Department of Medicine, University of Toronto, Toronto, Canada;
6. Institute of Medical Science, University of Toronto, Toronto, Canada