1 Department of Anesthesiology, Nanjing Drum Tower Hospital, Medical College of Nanjing University, Nanjing 210008, China.
2 Research Institute, HCor, São Paulo, Brazil; Center for Epidemiological Research, University of Southern Denmark, Odense, Denmark.
3 Department of Critical Care Medicine, Ghent University Hospital, Corneel Heymanslaan 10, 9000 Gent, Belgium. Electronic address: Jan.DeWaele@UGent.be.