1. Health Services Research Centre Royal College of Anaesthetists London UK
2. Research Department of Targeted Intervention Centre for Perioperative Medicine University College London London UK
3. Clinical Neurosciences (Pain Research) UCL GOS Institute of Child Health London UK
4. Department of Anaesthesia and Pain Medicine Great Ormond St Hospital NHS Foundation Trust London UK
5. The Children's Hospital of Philadelphia Perelman School of Medicine at the University of Pennsylvania Philadelphia PA USA