1. Allergy Unit, Instituto-Hospital CUF, Porto, Portugal
2. CINTESIS, School of Medicine, Center for Health Technology and Services Research, University of Porto, Portugal
3. Medicine, Education, R-D and Evaluation, Lda (MEDIDA), Porto, Portugal
4. MEDCIDS, School of Medicine, Department of Community Medicine, Health Information and Decision, University of Porto, Portugal
5. Porto Health School, Polytechnic Institute of Porto, Portugal