1 Zentrum für Pädiatrische Rheumatologie am Klinikum Stuttgart (ZEPRAS), Stuttgart, Germany.
2 Pediatric Nephrology, Rheumatology, Dermatology Unit National Referee Centre for Rheumatic and Autoimmune and Systemic Diseases in Children (RAISE), Hospices Civils de Lyon, Lyon, France.
3 Department of Women's and Children's Health Institute of Life Course and Medical Sciences, University of Liverpool and Department of Rheumatology Alder Hey Children's NHS Foundation Trust, Liverpool, UK.
4 Department of Paediatric Pneumology, Allergology and Neonatology, Children's Hospital, Medical School, Hanover, Germany.
5 German Rheumatism Research Centre Berlin Leibniz Institute and Department of Paediatric Pulmonology, Immunology, and Intensive Care Medicine Charité-Universitätsmedizin, Berlin, Germany.
6 Division of Pediatric Rheumatology Department of Pediatric Oncology, Hematology and Clinical Immunology, University Hospital, Medical Faculty Heinrich Heine University, Düsseldorf, Germany.
7 Department of Pediatrics, RWTH Aachen, Aachen, Germany.
8 Department of Pediatrics, Prof. Hess-Kinderklinik, Bremen, Germany.
9 Division of Dermatology and Rheumatology, Department of Pediatrics and Professor of PediatricsUniversity of Ottawa, Ottawa, Canada.