[1] Univ Hosp Tuebingen, Div Pediat Rheumatol, Dept Pediat, Tubingen, Germany
[2] Univ Marburg, Div Nephrol, Marburg, Germany
[3] Heinrich Heine Univ Dusseldorf, Clin Pediat Hematol Oncol & Clin Immunol, Dusseldorf, Germany
[4] Univ Hosp Ulm, Dept Pediat, Ulm, Germany
[5] Friedrich Alexander Univ FAU, Erlangen, Germany
[6] Erlangen Nurnberg & Univ Erlangen, Dept Internal Med 3, Rheumatol & Immunol, Erlangen, Germany
[7] Charite Univ Med Berlin, Dept Pediat, Div Pulmonol Immunol & Crit Care Med, Berlin, Germany
[8] Klinikum Bremen Mitte, Hess Kinderklin, Bremen, Germany
[9] Asklepios Clin Sankt Augustin, St Augustin, Germany
[10] Ctr Pediat & Adolescence Rheumatol, Hamburg, Germany
[11] Tech Univ Dresden, Pediat, Med Fak Carl Gustav Carus, Dresden, Germany
[12] Hosp St Georg GmbH Leipzig, Immuno Deficiency Ctr Leipzig IDCL, Leipzig, Germany
[13] Univ Hosp Frankfurt, Dept Med 2, Rheumatol, Frankfurt, Germany
[14] Novartis Pharma GmbH, Nurnberg, Germany
[15] Univ Heidelberg Hosp, Rheumatol, Heidelberg, Germany