1. Children's Hospital of Philadelphia, Philadelphia
2. Dr von Haunersches Kinderspital, University Children's Hospital, Munich
3. CSL Behring LLC, King of Prussia, PA
4. Hospital St. Georg GmbH Leipzig, Academic Teaching Hospital of the University of Leipzig, Leipzig
5. Mayo Clinic, Rochester, MN
6. University Hospital of Wales, Cardiff, UK
7. DallasAllergyImmunology and Medical City Children's Hospital, Dallas, TX, USA
8. PHOCUS Services LTD part of the Fishawack Group of Companies, Basle, Switzerland
9. Centre for Chronic Immunodeficiency, University Hospital Freiburg, Freiburg, Germany