1. Johns Hopkins Berman Institute of Bioethics, Baltimore, Maryland;
2. Division of General Internal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland;
3. Department of Medical Ethics and Health Policy, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;
4. Division of Pediatric Hematology/Oncology, IWK Health Centre and Dalhousie University, Halifax, Nova Scotia; and
5. Division of Pediatric Hematology/Oncology, The Herman and Walter Samuelson Children’s Hospital at Sinai, Baltimore, Maryland