1. Department of Obstetrics, Leiden University Medical Center, Leiden, The Netherlands;
2. Blood Transfusion Medicine, Oxford University Hospitals, and
3. NHS Blood and Transplant, University of Oxford, Oxford, United Kingdom;
4. Institute of Immunology and Transfusion Medicine, University Hospital Greifswald, Greifswald, Germany;
5. Department of Medicine, and
6. Department of Obstetric Medicine, Mount Sinai Hospital, Toronto, ON, Canada;
7. Center for Clinical Transfusion Medicine, University of Tuebingen, Tuebingen, Germany;
8. Diagnostic and Therapeutic Services, NHS Blood and Transplant, Oxford, United Kingdom;
9. Hospital for Sick Children, St. Michael’s Hospital, Toronto, ON, Canada;
10. University Health Network, University of Toronto, Toronto, ON, Canada;
11. Center for Innovation, Canadian Blood Services, Toronto, ON, Canada;
12. Division of Hematology-Oncology, Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Montreal, QC, Canada;
13. Division of Hematology and Thromboembolism, McMaster University, Hamilton, ON, Canada;
14. Australian Red Cross Blood Service, Brisbane, QLD, Australia;
15. Platelet Immunology Department, French Blood Services of Brittany, Rennes, France;
16. Weill Cornell Medical College, Cornell University, New York, NY;
17. Department of Laboratory Medicine, Diagnostic Clinic, University Hospital of North Norway, Tromsø, Norway;
18. Finnmark Hospital Trust, Hammerfest, Norway;
19. Institut National de la Transfusion Sanguine, Paris, France;
20. Department of Clinical Immunology and Transfusion Medicine, Regional and University Laboratories, Region Skåne, Lund, Sweden; and
21. Fetal Medicine Unit, Mount Sinai Hospital, Toronto, ON, Canada