1. Department of Pathology and Laboratory Medicine, Wing‐Kwai and Alice Lee‐Tsing Chung Transfusion ServiceDavid Geffen School of Medicine at UCLA Los Angeles California
2. Department of Pathology, Transfusion Medicine DivisionJohns Hopkins University School of Medicine Baltimore Maryland
3. Department of Pathology and Laboratory MedicineCedars‐Sinai Medical Center Los Angeles California
4. Department of Medicine, Hematology DivisionJohns Hopkins University School of Medicine Baltimore Maryland