aDepartment of Anaesthesiology and Intensive Care, University of Tartu, Tartu, Estonia

bDepartment of Intensive Care Medicine, Lucerne Cantonal Hospital, Lucerne

cDepartment of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland

dDepartment of Critical Care, Melbourne Medical School, University of Melbourne, Melbourne, Australia

Correspondence to Annika Reintam Blaser, Puusepa 8, Tartu 50406, Estonia. E-mail: [email protected]