1 Department of Anesthesiology, University Medical Center Göttingen, Robert Koch Straße 40, 37075, Göttingen, Germany. gattinoniluciano@gmail.com.
2 Department of Surgical Sciences, University of Turin, Turin, Italy.
3 Department of Adult Critical Care, Centre for Human and Applied Physiological Sciences, Guy's and St. Thomas' NHS Foundation Trust, King's College London, London, UK.