Abortion; Fetal well-being surveillance techniques (ultrasound, Doppler velocimetry, cardiotocography); Infections in pregnancy (toxoplasma, cytomegalovirus, rubella, chickenpox, viral hepatitis, HIV); Induction of fetal lung maturity; Diabetes in pregnancy; Congenital pathology of the fetus; Hypertension in pregnancy; Fetal growth restriction; Twin pregnancy; Labor induction; Maternal-fetal isoimmunization ; Preterm birth; Premature rupture of membranes; Prophylaxis of neonatal group B streptococcus infection; Heart disease in pregnancy; Thyroid disease in pregnancy; Autoimmune diseases in pregnancy; Maternal and fetal thrombocytopenia.