1 Department of Paediatrics, Clemenshospital, Münster, Germany.
2 Therapeutic Gene Regulation, Deutsches Rheuma-Forschungszentrum (DRFZ), Institute of the Leibniz Association, Berlin, Germany.
3 Center for Cell Therapy, Institut Paoli-Calmettes, Marseille, France.
4 Division of Nephrology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.
5 UK National Institute for Health Research Great Ormond Street Biomedical Research Centre, London, United Kingdom.
6 Arthritis Research UK Centre for Adolescent Rheumatology at University College London (UCL), University College London Hospitals (UCLH) and GOSH London, London, United Kingdom.
7 Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Palo Alto, CA, United States.
8 Department of Pediatric Immunology and Rheumatology, Wilhelmina Children's Hospital Utrecht, Utrecht, Netherlands.