1. Jon J van Rood Center for Clinical Transfusion Research, Sanquin Blood Supply Foundation, Leiden, the Netherlands.
2. Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands.
3. Stem Cell Research, Nuffield Division of Clinical Laboratory Sciences, Radcliffe Department of Medicine, University of Oxford, and NHS Blood and Transplant Oxford, Oxford, United Kingdom.