1. Stanford University School of Medicine, Stanford, California
2. Department of Anesthesia, Mercyhealth, Rockford, Illinois
3. Department of Anesthesia, University of Arkansas for Medical Sciences, Little Rock
4. Anaesthetic Service, Guy’s and St Thomas National Health Service Foundation Trust, London, United Kingdom
5. The Anaesthetic Department, King’s College London, London, United Kingdom
6. Anaesthetics Department, University College London Hospital, London, United Kingdom
7. Department of Anaesthesia, Watford General Hospital, Watford, United Kingdom
8. Department of Medical Social Sciences, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
9. Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, California