[1] Helsinki Univ Hosp, Depat Rheumatol, Helsinki, Finland
[2] Univ Helsinki, Helsinki, Finland
[3] Helsinki Univ Hosp, Dept Radiol, Helsinki, Finland
[4] Helsinki Univ Hosp, Dept Bacteriol & Immunol, Helsinki, Finland
[5] Kuopio Univ Hosp, Primary Hlth Care Unit, Kuopio, Finland
[6] Univ Tampere, Sch Med, Immunopharmacol Res Grp, Tampere, Finland
[7] Tampere Univ Hosp, Tampere, Finland