1. Division of Laboratory Medicine, Department of Pathology, University of Alabama at Birmingham, Birmingham, AL;
2. Department of Pathology and Laboratory Medicine, Children’s Hospital of Philadelphia, Philadelphia, PA;
3. Division of Pediatric Hematology/Oncology, Children’s Hospital of Alabama, Birmingham, AL; and
4. Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA