1. Division of Obstetrics and Prenatal Medicine; Department of Obstetrics and Gynaecology; Erasmus MC; University Medical Center; Rotterdam The Netherlands
2. Department of Internal Medicine-Transplantation; Erasmus MC; University Medical Center; Rotterdam The Netherlands
3. Department of Pathology; Reinier de Graaf Hospital; Delft The Netherlands
4. Department of Immunohaematology and Blood Transfusion; Leids University Medical Center; Leiden The Netherlands