1. Department of Fetal Maternal Medicine, Centro Hospitalar Universitário Lisboa Central, Faculdade de Ciências Médicas de Lisboa - Nova Medical School, Lisboa, Portugal
2. Department of Obstetrics and Gynecology, Centro Hospitalar e Universitário de São João, Porto, Portugal
3. Department of Obstetrics and Gynecology, Centro Hospitalar e Universitário Lisboa Norte, Lisboa, Portugal
4. Department of Obstetrics and Gynecology, Centro Hospitalar e Universitário do Algarve, Faro, Portugal
5. Department of Obstetrics and Gynecology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
6. Medical Institute of Coimbra, Hospital CUF Coimbra, Coimbra, Portugal