1. Hospital for Special Surgery, Weill Cornell Medical College; New York New York
2. McGill University; Montreal Quebec Canada
3. University of Toronto; Toronto Ontario Canada
4. Université de Sherbrooke; Sherbrooke Quebec Canada
5. St. Joseph's Health Care London, University of Western Ontario; London Ontario Canada
6. University of Manitoba; Winnipeg Manitoba Canada
7. University of British Columbia; Vancouver British Columbia Canada
8. Southlake Regional Health Centre; Newmarket Ontario Canada
9. Mount Sinai Hospital, University of Toronto; Toronto Ontario Canada
10. Institut de Rhumatologie; Montreal Quebec Canada
11. Hospital for Special Surgery, Weill Cornell Medical College, New York, New York, and Mount Sinai Hospital, University of Toronto; Toronto Ontario Canada