1. Department of Community Medicine, Information and Health Decision Sciences—MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal
2. Center for Health Technology and Services Research—CINTESIS, Faculty of Medicine, University of Porto, Porto, Portugal
3. Department of Gynecology-Obstetrics and Pediatrics, Faculty of Medicine of University of Porto, Porto, Portugal
4. Centro Hospitalar Universitário de S. João, Alameda Hernâni Monteiro, Porto, Portugal