1 Department of Medical Ethics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
2 Mary Ann & J. Milburn Smith Child Health Research, Advocacy, and Outreach Center, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois.
3 Division of Academic General Pediatrics and Primary Care, Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
4 Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia.
5 Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia.