1. Emory University School of Medicine and AFLAC Cancer Center and Blood Disorders Service, Children's Healthcare of Atlanta, Georgia;
2. Division of Hematology and Berman Institute of Bioethics, Johns Hopkins School of Medicine, Baltimore, Maryland;
3. Children's Mercy Bioethics Center, Children's Mercy Hospital, Kansas City, Missouri; and
4. Department of Pediatrics, University of Missouri, Kansas City, Missouri