PAPPA and systemic lupus erythematosus: APs: Anti-phospholipid syndrome, SLE: Systemic lupus erythematosus, PE: Pre-eclampsia, BMI: Body mass index, IVF: In vitro fertilization, SGA: Small for gestational age, PTL: Preterm labor, PAPP-A: Pregnancy-associated plasma-A, UtA-PI: Uterine artery pulsetillity index, NICU: Neonatal intensive care unit, IUFD: Intrauterine fetal demise