[1] Univ Trento, Hosp Trento, Rheumatol, Trento, Italy
[2] Mayo Clin, Thorac Dis Res Unit, Rochester, MN USA
[3] Cochin Hosp, Rheumatol, Paris, France
[4] Univ Penn, Hlth Syst, Rheumatol, Penn Med, Philadelphia, PA 19104 USA
[5] Landspitali Natl Univ Hosp Iceland, Rheumatol, Reykjavik, Iceland
[6] Univ Pavia, Rheumatol, Pavia, Italy
[7] NIAMSD, Rheumatol, Bethesda, MD 20892 USA
[8] Inst Salud Musculoesquelet INMUSC, Rheumatol, Madrid, Spain
[9] Leiden Univ, Med Ctr, Dept Rheumatol, Rheumatol, Leiden, Netherlands
[10] Zuyderland Med Ctr, Dept Rheumatol, Rheumatol, Heerlen, Netherlands