[1] Univ Utrecht, Dept Clin & Hlth Psychol, NL-3508 TC Utrecht, Netherlands
[2] Univ Utrecht, Univ Med Ctr, Dept Rheumatol & Clin Immunol, NL-3508 TC Utrecht, Netherlands
[3] Jeroen Bosch Hosp, Dept Rheumatol, Shertogenbosch, Netherlands
[4] Univ Groningen, Univ Med Ctr Groningen, Dept Internal Med, Div Clin Immunol, NL-9713 AV Groningen, Netherlands