1. Department of Anesthesia and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
2. Division of Traumatology, Surgical Critical Care and Emergency Surgery, Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
3. Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
4. Department of Anaesthesia, Intensive Care, and Pain, St. James’ Hospital, Dublin, Ireland
5. Department of Anaesthesia, Trinity College, Dublin, Ireland.