1. Department of Pediatric Rheumatology and Immunology, University Children’s Hospital, Münster, Germany
2. Department of Pediatric Hematology–Oncology, University of Duisburg–Essen, Essen, Germany
3. Department of Intensive Care Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
4. Division of Cancer Predisposition, St. Jude Children’s Research Hospital, Memphis, Tennessee; and
5. Department of Rheumatology, Cincinnati Children’s Hospital Medical Center and
6. Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio