Julian Savulescu1,2,3,4, Guy Kahane5,6,7, Christopher Gyngell8,9. 1. Oxford Uehiro Centre for Practical Ethics, Oxford, UK. julian.savulescu@philosophy.ox.ac.uk. 2. Wellcome Centre for Ethics and Humanities, University of Oxford, Oxford, UK. julian.savulescu@philosophy.ox.ac.uk. 3. Biomedical Ethics Research Group, Murdoch Children's Research Institute, Melbourne, Victoria, Australia. julian.savulescu@philosophy.ox.ac.uk. 4. Melbourne Law School, University of Melbourne, Melbourne, Victoria, Australia. julian.savulescu@philosophy.ox.ac.uk. 5. Oxford Uehiro Centre for Practical Ethics, Oxford, UK. 6. Faculty of Philosophy, University of Oxford, Oxford, UK. 7. Faculty of Philosophy, Pembroke College, Oxford, UK. 8. Department of Paediatrics, Melbourne Medical School, University of Melbourne, Melbourne, Victoria, Australia. 9. Murdoch Children's Research Institute, Melbourne, Victoria, Australia.