Thrombocytopenia, Neonatal AlloimmuneAntigens, Human PlateletThrombocytopeniaHLA-DRB3 ChainsIsoantibodiesBlood Transfusion, IntrauterinePlatelet CountPlatelet TransfusionIsoantigensIntegrin alpha2Integrin beta3Intracranial HemorrhagesMaternal-Fetal ExchangeBlood PlateletsInfant, NewbornImmunoglobulins, IntravenousPlatelet Membrane GlycoproteinsPregnancyPurpura, Thrombocytopenic, IdiopathicPurpura, ThrombocytopenicGraft Rejection