1. University Health Network; University of Toronto; Toronto; ON; Canada
2. Cedars-Sinai Medical Center; Los Angeles; CA; USA
3. Biostatistics/Epidemiology/Research Design (BERD) Core; Center for Clinical and Translational Sciences and Department of Epidemiology, Human Genetics and Environmental Sciences; School of Public Health, The University of Texas Health Science Center at Houston
4. National Institute of Arthritis and Musculoskeletal and Skin Diseases; National Institutes of Health; Bethesda; MD; USA
5. University of Texas Health Science Center at Houston; Houston; TX; USA
6. University of California; San Francisco (UCSF); San Francisco; CA; USA