[1] Univ Med Ctr Groningen, Rheumatol & Clin Immunol, Groningen, Netherlands
[2] MCL, Rheumatol, Leeuwarden, Netherlands
[3] MUMC, Rheumatol, Maastricht, Netherlands
[4] Univ Med Ctr Groningen, Lab Med, Groningen, Netherlands
[5] Univ Med Ctr Groningen, Radiol, Groningen, Netherlands
[6] MCL, Radiol, Leeuwarden, Netherlands
[7] Univ Med Ctr Groningen, Epidemiol, Groningen, Netherlands