[1] 9 Baby Family & Fertil Ctr, IVF Lab Unit, Bologna, Italy
[2] Natl Inst Hlth, ART Italian Natl Register, Natl Ctr Dis Prevent & Hlth Promot, Rome, Italy
[3] Humanitas Clin & Res Ctr IRCCS, Humanitas Fertil Ctr, Dept Gynecol, Div Gynecol & Reprod Med, Rozzano, Italy
[4] Demetra, Assisted Reprod Ctr, Florence, Italy
[5] GENERA, Ctr Reprod Med, Rome, Italy
[6] IRCCS, Dept Obstet & Gynecol, Reggio Emilia, Italy
[7] European Hosp, Ctr Reprod Med, Rome, Italy
[8] Univ Florence, Careggi Hosp, Assisted Reprod Ctr, Florence, Italy
[9] St Anna Hosp, Physiopathol Reprod & IVF Unit, Gynecol & Obstet U, Turin, Italy
[10] IRCCS Burlo Garofolo, Inst Maternal & Child Hlth, Trieste, Italy
[11] ASST Papa Giovanni XXIII, Dept Maternal Fetal & Pediat Med, Bergamo, Italy
[12] Natl Inst Hlth, ART Italian Natl Register, Natl Ctr Dis Prevent & Hlth Promot, Rome, Italy
[13] 9 Baby Family & Fertil Ctr, IVF Cilin Unit, Bologna, Italy