1. Clinical Senior Lecturer, Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London WC1H 9SH
2. Clinical Research Fellow, Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London
3. Research Assistant, Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London
4. Lecturer in Statistics, Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London
5. Consultant Nurse in Critical Care, University College London Hospital, London
6. Senior Statistician, Intensive Care National Audit and Research Centre, London
7. Professor of Health Services Research, Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London