1. Departments of Pediatrics and
2. Institute of Anatomy, Catholic University, I-00168 Rome, Italy
3. Laboratory of Immunohematology, Liguria, I-16142 Genoa, Italy
4. Department of Obstetrics and Gynecology, Genoa University Hospital, I-16121 Genoa, Italy
5. Obstetrics and Gynecology, Giannina Gaslini Children’s University Hospital, I-16147 Genoa, Italy