1. Group Health Research Institute; Seattle Washington
2. Pharmaceutical Health Services Research Department; School of Pharmacy; University of Maryland; Baltimore Maryland
3. St. Joseph's Hospital; McMaster University; Hamilton Ontario Canada
4. Center for Outcomes Research; University of Massachusetts Medical School; Worcester Massachusetts
5. Division of Geriatric Medicine; Leuven University Center for Metabolic Bone Diseases; Katholieke Universiteit Leuven; Leuven Belgium
6. Division of Rheumatology; INSERM UMR 1033; Université de Lyon; Hôpital E. Herriot; Hospices Civils de Lyon; Lyon France
7. School of Clinical Medicine; Addenbrooke's Hospital; University of Cambridge; Cambridge UK
8. MRC Lifecourse Epidemiology Unit; University of Southampton; Southampton UK
9. University of Pittsburgh; Pittsburgh Pennsylvania
10. Helen Hayes Hospital and Columbia University; West Haverstraw New York
11. Department of Internal Medicine III; Alfried Krupp Krankenhaus; Essen Germany
12. Department of Rheumatology; Paris Descartes University; Paris France
13. Department of Rheumatology; Cedars-Sinai/University of California at Los Angeles; Los Angeles California
14. Fred Hutchinson Cancer Research Center; Seattle Washington