1. Department of Pediatrics, Centro Hospitalar São João, Porto, Portugal
2. Faculty of Medicine
3. Department of Biomedicine, Faculty of Medicine
4. Department of Community Medicine, Information and Health Decision Sciences- MEDCIDS, Faculty of Medicine
5. Center for Health Technology and Services Research (CINTESIS), Faculty of Medicine
6. EpiUnit, Institute of Public Health
7. Department of Obstetrics, Gynecology and Pediatrics, Faculty of Medicine, Universidade do Porto, Porto, Portugal