1 Department of Anesthesiology and Intensive Care, ASST Santi e Paolo Hospital, University of Milan, Milan, Italy.
2 Department of Anesthesiology, Medical University of Göttingen, University Medical Center Göttingen, Robert Koch Straße 40, 37075, Göttingen, Germany.
3 Department of Anesthesiology, Intensive Care and Emergency Medicine Donau-Isar-Klinikum Deggendorf, Deggendorf, Germany.
4 Department of Adult Critical Care, Guy's and St Thomas' NHS Foundation Trust, Health Centre for Human and Applied Physiological Sciences, London, UK.
5 Department of Pulmonary and Critical Care Medicine, University of Minnesota and Regions Hospital, St. Paul, MN, USA.
6 Respiratory Unit, San Paolo Hospital, Dipartimento Scienze della Salute, Università degli Studi di Milano, Milan, Italy.
7 Department of Anesthesiology, Medical University of Göttingen, University Medical Center Göttingen, Robert Koch Straße 40, 37075, Göttingen, Germany. gattinoniluciano@gmail.com.