1. Department of Pathology, Division of Transfusion Medicine University of Michigan Ann Arbor Michigan USA
2. Department of Pathology and Laboratory Medicine Nemours/A.I. DuPont Hospital for Children Wilmington Delaware USA
3. Division of Anesthesiology, Pain and Perioperative Medicine Children's National Hospital, George Washington School of Medicine & Health Sciences Washington District of Columbia USA
4. Department of Pathology and Laboratory Medicine, Division of Transfusion Medicine Seattle Children's and University of Washington Seattle Washington USA
5. Division of Pathology & Laboratory Medicine Children's National Hospital, George Washington School of Medicine & Health Sciences Washington District of Columbia USA