[1] Cambridge Univ Hosp NHS Fdn Trust, Cambridge CB2 0QQ, England
[2] Univ Massachusetts, Sch Med, Ctr Outcomes Res, Worcester, MA USA
[3] McMaster Univ, St Josephs Healthcare, Hamilton, ON, Canada
[4] Katholieke Univ Leuven, Louvain, Belgium
[5] Univ Lyon, Div Rheumatol, Hop E Herriot, INSERM,U1033, Lyon, France
[6] Univ Southampton, MRC Lifecourse Epidemiol Unit, Southampton, Hants, England
[7] Autonomous Univ Barcelona, Hosp del Mar, IMIM, Barcelona, Spain
[8] Inst Carlos III, RETICEF, Barcelona, Spain
[9] ISCIII, RETICEF, Madrid, Spain
[10] Univ Pittsburgh, Pittsburgh, PA USA
[11] Fred Hutchinson Canc Res Ctr, Seattle, WA 98104 USA
[12] Helen Hayes Hosp, Reg Bone Ctr, W Haverstraw, NY USA
[13] Vrije Univ Amsterdam, Med Ctr, Dept Endocrinol, Amsterdam, Netherlands
[14] Alfried Krupp Hosp, Dept Internal Med 3, Essen, Germany
[15] Paris Descartes Univ, Cochin Hosp, Paris, France
[16] Univ Alabama Birmingham, Div Clin Immunol & Rheumatol, Birmingham, AL 35294 USA
[17] Cedars Sinai Med Ctr, Dept Rheumatol, Los Angeles, CA 90048 USA
[18] Columbia Univ, Med Ctr, New York, NY USA
[19] Mercy Hlth Osteoporosis & Bone Hlth Serv, Cincinnati, OH USA