1. Department of Obstetrics and Maternal-Fetal Medicine; Necker Enfants Malades Hospital, AP-HP; Paris France
2. Department of Prenatal Biochemistry; Robert Debré Hospital, AP-HP; Paris France
3. Department of Biochemistry; Necker Enfants Malades Hospital, AP-HP; Paris France
4. Department of Virology; Necker Enfants Malades Hospital, AP-HP; Paris France