1. Department of Paediatrics; Hospital de Santa Maria; Centro Académico de Medicina de Lisboa; Lisboa Portugal
2. Clinical Pharmacology Unit; Instituto de Medicina Molecular; Faculty of Medicine; University of Lisbon; Lisboa Portugal
3. Department of Paediatrics; Unidade de Torres Vedras; Centro Hospitalar do Oeste; Torres Vedras Portugal
4. Department of Paediatrics; Centro Hospitalar Lisboa Ocidental; Lisboa Portugal
5. Department of Paediatrics; Faculty of Medicine; University of Porto; Porto Portugal
6. CINTESIS-Center for Research in Health Technologies and Information Systems; Porto Portugal
7. EPI Unit; Institute of Public Health; University of Porto; Porto Portugal
8. Unidade de Saúde Familiar S. Julião; Centro de Saúde de Oeiras; Oeiras Portugal
9. Clínica Universitária de Pediatria; Faculty of Medicine; University of Lisbon; Portugal