[1] Radboud Univ Nijmegen, Med Ctr, Dept Rheumatol, NL-6500 HB Nijmegen, Netherlands
[2] Med Ctr Leeuwarden, Dept Rheumatol, Leeuwarden, Netherlands
[3] Med Spectrum Twente, Dept Rheumatol, Enschede, Netherlands
[4] Univ Twente, NL-7500 AE Enschede, Netherlands
[5] Gelderse Vallei Hosp, Dept Rheumatol, Ede, Netherlands