[1] Univ Modena & Reggio Emilia, Mother Infant Dept, Modena, Italy
[2] IRCCS Burlo Garofalo, Dept Obstet & Gynecol, Trieste, Italy
[3] Univ Turin, Dept Obstet & Gynecol, Turin, Italy
[4] Univ Milan, DISG Luigi Sacco, Milan, Italy
[5] Univ Milano Bicocca, Obstet & Gynecol Unit, Monza, Italy
[6] Univ Perugia, Ctr Perinatal & Reprod Med, I-06100 Perugia, Italy
[7] Univ Modena & Reggio Emilia, Dept Oncol Hematol & Resp Dis, Modena, Italy
[8] Univ Florence, Dept Obstet & Gynecol, Florence, Italy
[9] Univ Turin, Obstet & Gynecol Chair A, Turin, Italy
[10] Marche Polytech Univ, Ancona, Italy
[11] AUSL Modena, Ctr Evaluat Effectiveness Hlth Care, Modena, Italy