1 Department of Medicine and Surgery, Obstetrics and Gynaecology Unit, University of Parma, 43126 Parma, Italy; Department of Woman, Child and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; Università Cattolica del Sacro Cuore, 00168 Rome, Italy.
2 Department of Medicine and Surgery, Obstetrics and Gynaecology Unit, University of Parma, 43126 Parma, Italy.
3 Immunohematology and Transfusion Medicine, University Hospital of Parma, 43126 Parma, Italy.
4 Department of Medicine and Surgery, Obstetrics and Gynaecology Unit, University of Parma, 43126 Parma, Italy. Electronic address: tullio.ghi@unipr.it.