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Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, Países Baixos Division of Fetal Medicine, Department of Obstetrics, Leiden University Medical Center, Leiden, Países Baixos Department of Biostatistics, Leiden University Medical Center, Leiden, Países Baixos Sanquin Bloodbank, Southwest Region e Department of Immunohematology and Blood transfusion, Leiden University Medical Center, Leiden, Países Baixos.