[1] Natl Inst Arthrit Musculoskeletal & Skin Dis NIAM, Bethesda, MD USA
[2] NIH, Radiol & Imaging Sci, Bethesda, MD USA
[3] NIAMS, NIH, Bethesda, MD USA
[4] Univ S Florida, Tampa, FL USA
[5] Univ Toronto, Mt Sinai Hosp, Div Rheumatol, Toronto, ON, Canada
[6] McMaster Univ, Rheumatol, Hamilton, ON, Canada
[7] Cleveland Clin, Rheumat & Immunol Dis, Cleveland, OH USA
[8] Univ Penn, Philadelphia, PA USA
[9] Boston Univ, Sch Med, Boston, MA USA
[10] Mayo Clin, Rheumatol, Rochester, MN USA
[11] Univ Penn, Biostat Epidemiol & Informat, Philadelphia, PA USA