[1] Autonomous Univ Barcelona, Hosp del Mar, IMIM, Barcelona 08003, Spain
[2] Inst Salud Carlos III, RETICEF, Barcelona, Spain
[3] Univ Massachusetts, Sch Med, Ctr Outcomes Res, Worcester, MA USA
[4] McMaster Univ, St Josephs Hosp, Hamilton, ON, Canada
[5] Univ Verona, Dept Rheumatol, I-37100 Verona, Valeggio, Italy
[6] Katholieke Univ Leuven, Div Geriatr Med, Leuven Univ Ctr Metab Bone Dis, Louvain, Belgium
[7] Univ Lyon, INSERM, Dept Orthoped & Rheumatol, Hop E Herriot,Res Unit 831, Lyon, France
[8] Univ Cambridge, Addenbrookes Hosp, Sch Clin Med, Cambridge CB2 2QQ, England
[9] Univ Southampton, MRC Epidemiol Resource Ctr, Southampton Gen Hosp, Oxford, England
[10] Univ Oxford, Norman Collisson Chair Musculoskeletal Sci, Oxford, England
[11] Hop Edouard Herriot, Lyon, France
[12] Univ Pittsburgh, Pittsburgh, PA USA
[13] Fred Hutchinson Canc Res Ctr, Seattle, WA 98104 USA
[14] Helen Hayes Hosp, Reg Bone Ctr, W Haverstraw, NY USA
[15] Vrije Univ Amsterdam, Med Ctr, Dept Endocrinol, Amsterdam, Netherlands
[16] Alfried Krupp Hosp, Dept Internal Med 3, Essen, Germany
[17] Paris Descartes Univ, Cochin Hosp, Paris, France
[18] Univ Alabama, Div Clin Immunol & Rheumatol, Birmingham, AL 35294 USA
[19] Univ Sydney, Royal N Shore Hosp, Sydney, NSW 2006, Australia
[20] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[21] Columbia Univ, Med Ctr, New York, NY USA
[22] Univ Cincinnati, Bone Hlth & Osteoporosis Ctr, Cincinnati, OH USA