1. Centre for Human and Applied Physiological Sciences School of Basic and Medical Biosciences King's College London London UK
2. Department of Anaesthetics Royal Brompton and Harefield, part of Guy's and St. Thomas’ NHS Foundation Trust London UK
3. Intensive Care Unit Guy's and St Thomas’ NHS Foundation Trust London UK
4. Nuffield Division of Anaesthetics University of Oxford Oxford UK
5. Department of Biomechanics University of Nebraska Omaha Omaha Nebraska USA