[1] Univ Penn, Philadelphia, PA 19104 USA
[2] Boston Childrens Hosp, Cardiovasc Program, Boston, MA USA
[3] Boston Childrens Hosp, Crit Care Program, Boston, MA USA
[4] Harvard Univ, Sch Med, Dept Psychiat, Boston, MA 02115 USA
[5] Boston Childrens Hosp, Inst Professionalism & Eth Practice, Boston, MA USA
[6] Boston Childrens Hosp, Dept Cardiol, Boston, MA USA