1. Department of Obstetric and Gynecology, Prenatal Diagnostic Service, Reggio Emilia, Italy;
2. Azienda Socio Sanitaria Territoriale di Mantova, Department of Obstetrics and Gynecology, Carlo Poma Hospital, Mantova, Italy;
3. Department of Obstetrics and Gynecology, Brescia, Italy;
4. Universita degli Studi di Brescia Sezione Materno Infantile, Obstetrics and Gynecology, Brescia, Italy;
5. Arcispedale S.Maria Nuova, Reggio Emilia, Italy;
6. Hopital Universitaire Robert-Debre, Unite de Foetopathologie, Paris, France;
7. Hopital Universitaire Robert-Debre, Obstetrics and Gynecology, Paris, France;
8. Paulista School of Medicine - Federal University of São Paulo, Obstetrics, São Paulo, Brazil