[1] Leiden Univ, Med Ctr, Rheumatol, Leiden, Netherlands
[2] Leiden Univ, Med Ctr, Dept Rheumatol, Leiden, Netherlands
[3] Leiden Univ, Med Ctr, Radiol, Leiden, Netherlands
[4] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[5] Univ Padua, Dept Med DIMED, Rheumatol Unit, Padua, Italy
[6] Amsterdam Rheumatol Ctr, Clin Immunol & Rheumatol, Amsterdam, Netherlands
[7] Gothenburg Univ, Sahlgrenska Acad, Dept Rheumatol & Inflammat Res, Gothenburg, Sweden