1. Adult Intensive Care Unit, Nottingham University Hospitals NHS Trust, Nottingham, UK
2. Institute for Biomedical Ethics, University of Basel, Basel, Switzerland
3. Care and Public Health Research Institute, Maastricht University, Maastricht, Netherlands
4. Medical Critical Care Services, Inova Fairfax Hospital, Falls Church, VA, USA
5. Ethics Unit, University Hospital of Lausanne, Lausanne, Switzerland