[1] Univ Oxford, Ethox Ctr, Nuffield Dept Populat Hlth, Oxford, England
[2] Univ Oxford, Fac Philosophy, Oxford Uehiro Ctr Pract Ethics, Oxford, England
[3] Great Ormond St Hosp Sick Children, Louis Dundas Ctr Childrens Palliat Care, London, England
[4] Yale Sch Med, Dept Pediat, Div Neonatal Perinatal Med, New Haven, CT USA
[5] Great Ormond St Hosp Sick Children, Louis Dundas Ctr Childrens Palliat Care, Barclay House,Great Ormond St, London WC1N 3JH, England