1 Department of Anesthesiology, University Medical Center Göttingen, Göttingen, Germany.
2 Department of Health Sciences, University of Milan, Milan, Italy.
3 Section of Anaesthesiology, Intensive Care and Pain Medicine, Department of Health Sciences, University of Florence, Florence, Italy.
4 IRCCS San Raffaele Scientific Institute, Milan, Italy.
5 Department of Anesthesia, Intensive Care and Emergency, City of Health and Science Hospital, Turin, Italy; and.
6 Department of Adult Critical Care, Guy's and St. Thomas' NHS Foundation Trust, Centre for Human and Applied Physiological Sciences, King's College London, London, United Kingdom.