1. Faculty of Medicine, University of Porto, Porto, Portugal;
2. Department of Gynecology, Hospital Privado da Boa Nova, Matosinhos, Portugal;
3. Department of Obstetrics and Gynecology, Centro Hospitalar de São João, EPE, Porto, Portugal;
4. Center for Research in Health Technologies and Information Systems (CINTESIS), Faculty of Medicine, University of Porto, Porto, Portugal;
5. Department of Obstetrics and Gynecology, Centro Hospitalar de São João, EPE, Faculty of Medicine, University of Porto, Porto, Portugal