1. Research Group for Gene Modification in Stem Cells, Center for Cell and Gene Therapy Frankfurt, Paul-Ehrlich-Institute, Langen, Germany.
2. Institute for Transfusion Medicine and Immunohematology, Goethe University, Frankfurt, Germany.
3. German Red Cross Blood Service Baden-Württemberg-Hessen, Institute Frankfurt, Germany.
4. Department of Medicine/Division of Hematology, University of Washington, Seattle, Washington.