[1] Univ Parma, Dept Med & Surg, Obstet & Gynaecol Unit, I-43126 Parma, Italy
[2] Fdn Policlin Univ A Gemelli IRCCS, Dept Woman Child & Publ Hlth, I-00168 Rome, Italy
[3] Univ Cattolica Sacro Cuore, I-00168 Rome, Italy
[4] Univ Hosp Parma, Immunohematol & Transfus Med, I-43126 Parma, Italy
[5] Univ Parma, Dept Med & Surg, Obstet & Gynaecol Unit, Via Gramsci 14, I-43126 Parma, Italy