From the Center for Biomedical Ethics and Society, Vanderbilt University Medical Center (A.M.M., U.E.A., E.W.C.), and the Department of Obstetrics and Gynecology (E.W.B.), the Division of Neonatology (U.E.A.), and the Department of Pediatrics (E.W.C.), Vanderbilt University School of Medicine - both in Nashville.