1 Department of Anesthesiology, Medical University of Göttingen, University Medical Center Göttingen, Robert Koch Straße 40, 37075, Göttingen, Germany. gattinoniluciano@gmail.com.
2 Department of Anesthesiology and Intensive Care, ASST Santi Paolo e Carlo Hospital, University of Milan, Milan, Italy.
3 Department of Adult Critical Care, Health Centre for Human and Applied Physiological Sciences, Guy's and St Thomas' NHS Foundation Trust, London, UK.