1. Allergy Unit Hospital & Instituto CUF Porto Porto Portugal
2. Department of Immunology, Rheumatology and Allergy Healthy Ageing Research Centre Medical University of Łódź Łódź Poland
3. Basic and Clinical Immunology Department of Pathology Faculty of Medicine University of Porto Porto Portugal
4. Serviço de Imunoalergologia Centro Hospitalar São João E.P.E. Porto Portugal
5. Laboratory of Pediatric Immunology Department of Microbiology and Immunology KU Leuven Leuven Belgium
6. Division of Pediatrics UZ Leuven Leuven Belgium
7. Institute for Clinical Medicine University of Oslo Oslo Norway
8. Laboratory of Clinical Immunology Department of Microbiology and Immunology KU Leuven Leuven Belgium