1. Department of Philosophy, University College London , Gower Street, London WC1E 6BT , UK
2. Institute for Ethics and History, University of Applied Sciences for Police and Public Administration in North Rhine-Westphalia (HSPV NRW) , 52068 Aachen , Germany
3. Medical Ethics, British Medical Association , London WC1H 9JP , UK
4. Department of Philosophy, University College London , London WC1E 6BT , UK
5. Faculty of Public Health , London NW1 4LB , UK