1 Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Paediatric Respiratory Medicine, Immunology and Critical Care Medicine, Berlin, Germany; Deutsches Rheuma-Forschungszentrum Berlin, a Leibniz Institute, Programme area Epidemiology and Health Services Research, Berlin 10117, Germany. Electronic address: minden@drfz.de.
2 Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Paediatric Respiratory Medicine, Immunology and Critical Care Medicine, Berlin, Germany; German Center for Child and Adolescent Health, partner site Berlin, Germany; Deutsches Rheuma-Forschungszentrum Berlin, a Leibniz Institute, Programme area Systems Rheumatology, Berlin, Germany.