Is the Lack of Prior Exposure to Sperm Antigens Associated With Worse Neonatal and Maternal Outcomes?

The objective of this study is to determine if the lack of exposure to sperm antigens is associated with worse maternal and neonatal outcomes in pregnancies obtained after ICSI (intracytoplasmic sperm injection)-TESE (testicular sperm extraction) for obstructive azoospermia. The primary outcomes that will be investigated include: * Maternal outcomes: live birth rate (LBR), abortion rate, and the rate of the main obstetrics complication, such as pre-eclampsia, gestational hypertension and diabetes mellitus. * Neonatal outcomes: gestational age, prematurity rate, birth weight, sex ratio, 1- and 5-min APGAR, birth defects.