[1] Univ Helsinki, Helsinki, Finland
[2] Paijat Hame Cent Hosp, Dept Internal Med, Lahti, Finland
[3] Univ Tampere, Sch Med, Tampere, Finland
[4] Paijat Hame Cent Hosp, Dept Rheumatol, Lahti, Finland
[5] Univ Helsinki, Dept Med, Network Acad Hlth Ctr, Helsinki, Finland
[6] FCG Finnish Consulting Grp Ltd, Helsinki, Finland
[7] Jyvaskyla Cent Hosp, Rheumatol, Jyvaskyla, Finland
[8] RAID Working Grp EULAR, Zurich, Switzerland