1. Allergy Unit, CUF-Porto Hospital and Instituto, Estrada da Circunvalação, Porto, Portugal
2. CINTESIS - Center for Health Technology and Services Research, Faculty of Medicine, University of Porto, Portugal
3. Department of Immunoallergology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte EPE, Lisbon, Portugal
4. Medicina, EDucação, I and D e Avaliação, Lda MEDIDA, Porto, Portugal
5. Basic and Clinical Immunology, Pathology Department, Faculty of Medicine, University of Porto, Portugal
6. University Clinic of Immunoallergology, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
7. MEDCIDS - Department of Community Medicine, Information and Health Decision Sciences, Faculty of Medicine, University of Porto, Portugal