[1] Univ Med Ctr, Dept Med 3, Div Rheumatol, Dresden, Germany
[2] Tech Univ Dresden, Fac Med, Dresden, Germany
[3] Harvard Med Sch, Brigham & Womens Hosp, Dept Med, Div Rheumatol Immunol & Allergy, Boston, MA 02115 USA
[4] Charite Univ Med Berlin, Dept Rheumatol & Clin Immunol, Berlin, Germany
[5] Free Univ Berlin, Berlin, Germany
[6] Humboldt Univ, Berlin, Germany
[7] Berlin Inst Hlth, Berlin, Germany
[8] Mt Sinai Hosp, Toronto Western Hosp, Dept Med, Div Rheumatol, Toronto, ON, Canada
[9] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada