[1] Univ Bologna, St Orsola Malpighi Univ Hosp, Dept Obstet & Gynecol, Via Massarenti 13, I-40138 Bologna, Italy
[2] Univ Alexandria, El Shatby Hosp, Dept Obstet & Gynecol, Alexandria, Egypt
[3] Univ Bologna, St Orsola Malpighi Univ Hosp, Dept Pathol, I-40138 Bologna, Italy
[4] Univ Bologna, St Orsola Malpighi Univ Hosp, Dept Pediat Surg, I-40138 Bologna, Italy