[1] Karolinska Hosp, Dept Med, Rheumatol Unit, S-10401 Stockholm, Sweden
[2] Karolinska Hosp, Dept Med, Physiotherapy Unit, S-10401 Stockholm, Sweden
[3] Karolinska Hosp, Dept Radiol, S-10401 Stockholm, Sweden
[4] Huddinge Hosp, Div Pathol, S-14186 Huddinge, Sweden