[1] Karolinska Inst, Div Rheumatol, Dept Med Solna, Stockholm, Sweden
[2] Med Univ Vienna, Div Rheumatol, Dept Internal Med 3, Vienna, Austria
[3] Stockholm Hlth Care Serv, Acad Specialist Ctr, Ctr Rheumatol, Stockholm, Sweden
[4] Karolinska Univ Hosp, Rheumatol Unit, Stockholm, Sweden