[1] Univ Groningen, Univ Med Ctr Groningen, Dept Rheumatol & Clin Immunol, NL-9700 RB Groningen, Netherlands
[2] Kennemer Gasthuis, Dept Internal Med, Haarlem, Netherlands
[3] Univ Med Ctr Utrecht, Dept Rheumatol & Clin Immunol, Utrecht, Netherlands
[4] Univ Med Ctr, Erasmus MC, Dept Internal Med, Rotterdam, Netherlands
[5] Radboud Univ Nijmegen, Med Ctr, Dept Nephrol, NL-6525 ED Nijmegen, Netherlands
[6] Vrije Univ Amsterdam Med Ctr, Dept Rheumatol, Amsterdam, Netherlands