Sandra Ammann, PhD a, Sebastian Fuchs, PhD a, Lydia Martin-Martin, MD b, Carla N. Castro, PhD a, Benedikt Spielberger, MD c, Christian Klemann, MD a, d, e, Roland Elling, MD a, d, Maximilian Heeg, MD a, d, Carsten Speckmann, MD a, d, Ina Hainmann, MD f, Petra Kaiser-Labusch, MD g, Gerd Horneff, MD h, i, Julian Thalhammer, MD a, d, Robbert G. Bredius, MD j, Udo zur Stadt, PhD k, Kai Lehmberg, MD k, l, Ilka Fuchs, Msc a, Caroline von Spee-Mayer, Msc a, Philipp Henneke, MD a, d, Stephan Ehl, MD a, d 
a Institute for Immunodeficiency, Center for Chronic Immunodeficiency, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
b Department of Clinical Immunology, Hospital General Universitario Gregorio Marañón, Madrid, Spain
c Dr von Hauner Children's Hospital, LMU Munich, Germany
d Center for Pediatrics, Department of Pediatric Hematology and Oncology, University Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
e Department of Pediatric Pneumology, Allergy and Neonatology, Hannover Medical School, Hannover, Germany
f Department of Pediatric Hematology and Oncology, University Hospital Bonn, Bonn, Germany
g Professor-Hess-Kinderklinik, Bremen, Germany
h Department of Pediatrics, Asklepios Clinic Sankt Augustin, Centre for Pediatric Rheumatology, Sankt Augustin, Germany
i Department of Pediatric and Adolescents medicine, Medical faculty, University Hospital of Cologne, Cologne, Germany
j Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
k Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
l Division of Pediatric Stem Cell Transplantation and Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany